Is Israels colonial project still a topic of discussion ?

For folks of the free world, it is not. For partisans of Israel, unfortunately, it still is.
The original Zionists legitimized their claim to Palestine exactly because they were colonists and superior to the natives. While I understand how it can be difficult to escape a worldview that was planted in you at a young age, there is a mountain of easily available resources and historic documents available to anyone who is even a little bit critical or intellectually curious.
When we speak of Israel as a settler colony, we refer to a very specific phenomenon. Settler colonialism differs from classic colonialism, in that settler colonialism only initially and temporarily relies on an empire for their existence. In many situations, the colonists aren’t even from the empire supporting them, and end up fighting the very sponsor that ensured their survival in the first place. Another difference is that settlers are not merely interested in the resources of these new lands, but also in the lands themselves, and to carve out a new homeland for themselves in the area.
The obvious issue here is that these lands were already inhabited by other people before their arrival.
This is when the settler “logic of elimination” comes into play. Coined by scholar Patrick Wolfe, this means that the settlers needed to develop not only moral justifications for the removal of the natives, but also the practical means to ensure its success. This could take the form of ethnic cleansing, genocide or other gruesome tools of ethnocide.
If you’re at all familiar with Zionist talking points, you can see this logic of elimination in motion. “A land without a people for a people without a land“, “there is no such thing as a Palestinian, “Israel made the desert bloom” and many other talking points illustrate this perfectly. For example, you can immediately see how denying the existence of Palestinians resembles the Terra Nullius argument used by colonists all over the world . All of these talking points are aimed at justifying the dispossession of the Palestinians and legitimizing Zionist claims to the land they wished to colonize. As for the practical means to remove the natives, the Nakba remains a testimony to such crimes.
The claim that Zionism is merely Jewish self-determination also conflates the Jewish people with political Zionism, an ideology finding its origins in Europe in the late 1800s. At the time, the Jewish people were largely uninterested in Zionism. As a matter of fact many Jewish groups were fiercely anti-Zionist. The attempt to conflate the two is an attempt to give legitimacy to self-professed settlers from Europe, and portray any criticism of the Zionist project as inherently antisemitic.
The colonization plan was prior to the 1900s. An article about a Conference of Zionists published on July 20, 1899 in the New York Times depicts how the Conference sought to “colonize Palestine” and discussed the purchasing of land with English Zionists.
Significantly, many early apostles of Zionism had been proud to embrace the colonial nature of their project. The eminent Revisionist Zionist leader Ze’ev Jabotinsky, godfather of the political trend that has dominated Israel since 1977, upheld by Prime Ministers Menachem Begin, Yitzhak Shamir, Ariel Sharon, Ehud Olmert, and Benjamin Netanyahu, was especially clear about this. Jabotinsky wrote in 1923:

“Every native population in the world resists colonists as long as it has the slightest hope of being able to rid itself of the danger of being colonised. That is what the Arabs in Palestine are doing, and what they will persist in doing as long as there remains a solitary spark of hope that they will be able to prevent the transformation of ‘Palestine’ into the ‘Land of Israel.’”

Such honesty was rare among other leading Zionists, who like Herzl protested the innocent purity of their aims and deceived their Western listeners, and perhaps themselves, with fairy tales about their benign intentions toward the Arab inhabitants of Palestine.
However, even Herzl himself, one of the founders of political Zionism wrote in 1902 to infamous colonizer Cecil Rhodes, arguing that Britain recognized the importance of “colonial expansion”:

You are being invited to help make history,” he wrote, “It doesn’t involve Africa, but a piece of Asia Minor ; not Englishmen, but Jews . How, then, do I happen to turn to you since this is an out-of-the-way matter for you? How indeed? Because it is something colonial.”

Nordau, Herzl’s right hand man, even rightfully called Zionist settlements in Palestine “colonies”:

“Zionism rejects on principle all colonization on a small scale, and the idea of “sneaking” into Palestine. The Zionists have therefore devoted themselves preeminently to a zealous and tireless advocacy of the uniting of the already existing Jewish colonies in Palestine with those who until now have given them their aid and who of late have inclined towards the withdrawal of their support from them.”

Menachem Usishkin, chairman of the Jewish National Fund, was known for his calls to rid Palestine of its natives:

“What we can demand today is that all Transjordan be included in the Land of Israel. . . on condition that Transjordan would be either be made available for Jewish colonization or for the resettlement of those [Palestinian] Arabs, whose lands [in Palestine] we would purchase. Against this, the most conscientious person could not argue . . . For the [Palestinian] Arabs of the Galilee, Transjordan is a province . . . this will be for the resettlement of Palestine’s Arabs. This the land problem. . . . Now the [Palestinian] Arabs do not want us because we want to be the rulers. I will fight for this. I will make sure that we will be the landlordsof this land . . . . because this country belongs to us not to them . . . “

Revisionist Zionist Vladimir Jabotinsky, also wrote in his infamous Iron Wall doctrine:

“A voluntary reconciliation with the Arabs is out of the question either now or in the future. If you wish to colonize a land in which people are already living, you must provide a garrison for the land, or find some rich man or benefactor who will provide a garrison on your behalf. Or else-or else, give up your colonization, for without an armed force which will render physically impossible any attempt to destroy or prevent this colonization, colonization is impossible, not difficult, not dangerous, but IMPOSSIBLE!… Zionism is a colonization adventure and therefore it stands or falls by the question of armed force. It is important… to speak Hebrew, but, unfortunately, it is even more important to be able to shoot – or else I am through with playing at colonizing.”

These quotations are merely the tip of the iceberg, but lest you think I am cherry-picking and choosing out of context passages, I invite you to read their original writings. There are only so many mental gymnastics you can perform to try and find a different meaning to “Zionism is a colonization adventure.” One of them is the claim that the Zionists adopted this kind of language only to convince the great imperial powers. It must have been a pretty convincing act, then, as its practice is still ongoing after over 100 years.
This, of course, is nonsense. It was not a question of rhetoric, but also execution. The first Zionist bank established was named the ‘Jewish Colonial Trust’ and the whole endeavor was supported by the ‘Palestine Jewish Colonization Association’ and the‘Jewish Agency Colonization Department’. The most important of these institutions was the Jewish Colonization Association (in 1924 renamed the Palestine Jewish Colonization Association). This body was originally established by the German Jewish philanthropist Baron Maurice de Hirsch and later combined with a similar organization founded by the British peer and financier Lord Edmond de Rothschild. The JCA provided the massive financial support that made possible extensive land purchases and the subsidies that enabled most of the early Zionist colonies in Palestine to survive and thrive before and during the Mandate period.
In March 1896, the Jewish Colonial Trust was incorporated in London, with the goal of supporting the development of a Jewish home in Palestine.
Unremarkably, once colonialism took on a bad odor in the post World War II era of decolonization, the colonial origins and practice of Zionism and Israel were whitewashed and conveniently forgotten in Israel and the West. In fact, Zionism, for two decades the coddled step-child of British colonialism, rebranded itself as an anticolonial movement. The occasion for this drastic makeover was a campaign of sabotage and terrorism launched against Great Britain after it drastically limited its support of Jewish immigration with the 1939 White Paper on the eve of World War II. This falling-out between erstwhile allies (to help them fight the Palestinians in the late 1930s, Britain had armed and trained the Jewish settlers it allowed to enter the country) encouraged the outlandish idea that the Zionist movement was itself anticolonial.
There was no escaping the fact that Zionism initially had clung tightly to the British Empire for support, and had only successfully implanted itself in Palestine thanks to the unceasing efforts of British imperialism. It could not be otherwise, for as Jabotinsky stressed, only the British had the means to wage the colonial war that was necessary to suppress Palestinian resistance to the takeover of their country. This war has continued since then, waged sometimes overtly and sometimes covertly, but invariably with the tacit or overt approval, and often the direct involvement, of the leading powers of the day and the sanction of the international bodies they dominated, the League of Nations and the United Nations.
Today, the conflict that was engendered by this classic nineteenth-century European colonial venture in a non-European land, supported from 1917 onward by the greatest Western imperial power of its age, is rarely described in such unvarnished terms. Indeed, those who analyze not only Israeli settlement efforts in Jerusalem, the West Bank, and the occupied Syrian Golan Heights, but the entire Zionist enterprise from the perspective of its colonial settler origins and nature are often vilified. Many cannot accept the contradiction inherent in the idea that although Zionism undoubtedly succeeded in creating a thriving national entity in Israel, its roots are as a colonial settler project (as are those of other modern countries: the United States, Canada, Australia, and New Zealand). Nor can they accept that it would not have succeeded but for the support of the great imperial powers, Britain and later the United States. Zionism, therefore, could be and was both a national and a colonial settler movement at one and the same time.