Not trying to be dialectical and shit, but it both does and doesn't exist. For those cretins who think they can poach anarchist-curious and anarchist-friendly folks for their absurd, ahistorical, ignorant third-positionist, pseudo-tribal bullshit, "national anarchism" [sic] is a real thing. Based on total fantasy, but a real thing.
It is also a completely false thing, a utopian (in its original meaning of "no place") fabrication that has no basis in anarchist discourse or history. It is not anti-statist, it is not anti-hierarchical, and it is not even anti-capitalist. Three strikes.
Therefore it should be destroyed without mercy.