For what it’s worth, I also have YouTube Premium and watch a lot of gun content and conservative political content on YouTube, and I don’t think I’ve ever been recommended any sort of explicitly anti-Semitic or neo-Nazi content.
I do suspect that the recommendation algorithm for Premium is slightly different and perhaps more favorable to gun content. Pretty much all gun content is demonetized, and anything that’s demonetized gets recommended less; I suspect Premium is an exception to this. Also, there may be more gun content than usual lately because SHOT Show, a trade show for the gun industry, is happening this week.