it depends, primitivism in its caricature of forcing people to abandon civilization by forcibly destructing (medical) progress, targeting scientists etc is considered a reactionary ideology much like maoist third worldism is here. not because we dont recognize the revolutionary leftist origins of these movements but because it has morphed in to a reactionary movement at odds with progress (and if i'm honest because their adherents are particularly disruptive of discussion, while many other ideologies have their own pet subjects they dont tend to interject them in every totally unrelated subject discussion as MTW's, hardline primmies and religious folks tend to do).
but many users on this board (many mods and even admins like myself included) are influenced by a whole range of anti- and post-civ writers and movements and they are frequently discussed here.
The mind is its own place, and in itself Can make a Heaven of Hell, a Hell of Heaven. What matter where, if I be still the same, And what I should be, all but less than he Whom thunder hath made greater?
Here at least We shall be free