I think the alt-right stands to benefit from an anarcho-capitalist society, and I think it would allow you to form communities that tick off all your boxes and would thrive, but to call the alt-right the "real libertarians" by that virtue seems silly to me. Categorically this seems false, as a group of nationalist Japanese stand as much to gain from libertarian order, and in the same regard, but you would not categorize them under alt-right. The freedom of association that comes with the libertarian order allows anyone who prefers his incrowd to associate with none who do not belong, but this freedom is extended to anyone regardless of race.

Certainly there is a huge overlap, as the alt-right just wants to be left alone by certain groups, while the anarcho capitalist wants to be left alone by everyone, but equivalence does not seem to be there.