Check the modlog for proof, a discussion post about moving this instance to an instance that shan't be named now got removed for "linking to instance featuring pedo content".
Ironically that exact possibility was reason for the discussion in the first place so seeing it happen this quickly is a bit funny.
Not sure how best to go about linking to said instance since it seems to get your content removed. DM's would be the only solution I guess but not sure if those are checked as well.
I may have an extremely warped opinion on this due to several reasons (imo mostly due to irl encounters with adult people that would put you on a watch list due to how young they look) but I think in the end it usually boils down to anime/manga just being terrible media for portraying how old a character actually is. The oldest anime character you can draw will still look significantly younger than a person you meet irl simply because the art style hides a lot of the age marks.
Edit: which is not to say that there isn't a lot of CSAM hiding, it's just imo the stuff that gets popular on SFW platforms is rarely that stuff