I doubt it. It's not a blanket "buy everything" policy; we do have some standards we abide by like significance and value to the collection, the level of interest the community would have in something, how much it's been covered beforehand by reviewers or the media in general, etc.
Even if by some chance we actually did bring something like that into the collection, the policy allows for materials to be challenged by patrons. One probably wouldn't be enough to get something removed, but I imagine something like that kind of manifesto wouldn't stop at just one challenge.
I'm no fonder of his smug, libertarian prepper ass than you are, but personally the best way to make him feel the consequences of his actions is to leave that baggage where it is to rot and just concentrate on making Lemmy and any other alternatives you may be on the kind of community that Reddit used to be and people valued.