First, it says he was on the fed radar since high school, which is the same thing that is true of all fed assets pretty much. Enough that it's the playbook by the fed. But that's not evidence enough on it's own. Here's the actual evidence
According to Thomas Rousseau
"Rousseau believes that Donald Trump is a white supremacist in line with the values of Patriot Front however he only "indirectly supports" people like Rousseau.[4]"
and also
Rousseau claims that "[White people are] being relentlessly erased on all sides, by the Jew, by non-whites who hate us"
Every dissident right person I have ever encountered hates Donald Trump and considers him a "traitor to white people and he's Jew owned". Interesting that Rousseau seems to be the only dissident right person who aligns with the media narrative of Trump being a white supremacist.
Who benefits from this statement for his organization? It doesn't help Patriot Front recruit mainstream conservatives (who love Trump but reject white nationalism). It doesn't help them with the dissident right (who think Trump is a Jew owned puppet).
The only entity that benefits from this statement is the establishment media and federal agencies. Rousseau's statement provides the exact, explicit link that the media needs to validate their narrative. It allows them to print headlines saying, "White supremacist leader confirms alignment with Trump."
Was there anyone except for leftists calling Trump a white supermacists at any point in history?
The most someone like Rosseau would say out of naivity if you want to call it that, is "Trump generally supports our values" which is true to the degree that Trump supports older America and not globohomo. However by 2020 Trump had already hired Omarosa to his cabinet, and frequently praised black people. When has Trump ever given the impression that he's a white nationalist?
I watched things like Celebrity Apprentice and Trump was very pro-black. He does the typical white guilt thing of praising black people needlessly over just doing the bare minimum which is why it was always laughable that he was considered a white supremacist by the left as he, just like the left constantly wants to curry favor with black people.
This doesn't make me dislike Trump. It's just a universal sort of mindset of people who are older and you shrug and go "whatever, as long as he's not making it policy, like Obama clearly did, where Obama tried to divide America along racial lines".
So his statement is baffling no matter what year it's made and shows, if it's sincere, he's not very politically literate which makes it odd that he's the leader of some "highly principled" political movement that patriot front supposedly is.