Not sure if you've seen the clips, but Nick Fuentes has publicly "declared war" on the Trump campaign. It seems like he's going to try something similar to what he did to Charlie Kirk and TPUSA a few years back. Basically trolling, complaining, and harassing the campaign. Putting them on the spot and forcing them to answer unflattering questions.
I think it makes sense strategically from his perspective. If Trump wins by a landslide, the left falls apart and Fuentes becomes one of the main opposition leaders left standing. If Trump loses, Fuentes can take credit and the takeaway would be that Trump lost because he couldn't hold on to the most right-wing voters.
I think Nick expects Trump to lose right now and thinks the media will say he lost because he chose Vance and was too far-right, too politically incorrect etc. Nick wants to shift the blame onto his campaign staff and send the message that he lost because he went too establishment and lost the "base" which Fuentes seems to think is himself and his supporters.
Basically, it's a power move.
By attacking Trump instead of supporting him this year, it sends the message that the "far-right" is against his campaign and forces the media to shift the blame somewhere else. Fuentes seems to think this will position him and the right-wing in general better going forward regardless of if Trump wins or loses. If Trump does end up winning, it would shift the Overton window, effectively making Trump the new "center" of American politics.
Actually it makes more sense that he’s just a fed asset and not a very good one at that.