I think it is highly semantical issue. Collective vs individual. So it seems, that they (well, some of them) assume, that only collective can “profit” from private property, not individual? But the point is there that a collective is just a fockin bunch of individuals.
He says, “Anarchists are not voluntaryist. Anarchism is about individual ideals, not collective.” He says similar things about anarchy being individual and not collective throughtout the thread.
Then i guess Anarcho-socialists, Anarcho-communists, and Anarcho-syndicalists aren’t Anarchists either because those ideals are very collectivist. In fact Rothbard wrote an essay about how historically anarchy was a collectivist idealogy, which caused him to reconsider his label of ‘anarcho-capitalism’ in favor of what he called ‘nonarchist’. He changed his mind however and became comfortable with ‘anarcho-capitalism.’