You're right that the post is badly written, because it just sorta says "this is a place that promotes paraphilia!" But in this particular case, this server hosts reprehensible content and is not just a community for kinky people that happens to have pedos on it.

It's like if there were a knife enthusiast instance where the largest local community was about committing crime, where the admin self-identifies as being into commiting crimes. It's absolutely true most knife enthusiasts have no interest in committing crime, and therefore the knife enthusiasts who don't want to commit crime probably wouldn't join the server that promotes crime.

The analogy falls apart a bit because it's true that they're not doing anything illegal over there, at least not publicly. But they're still promoting viewing kids sexually, promoting sexual contact with kids, even talking about nude photos of kids.