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.
To be fair with the above, even considering that he’s being disingenuous*, his [AFAIK incorrect] claim is not “anime is child porn”, it’s “that anime instance has child porn”.
*note how he’s trying to transform “is this CSAM?” into a subjective matter. That’s rather close to the moving goalposts fallacy.