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."