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.
It really isn't the largest though, maybe by users but certainly not by activity. For example the post about "The Boy and Heron" winning a golden globe got 9 comments on the unspeakable instance and only 2 here. From my own experience posting to both that seems to be the norm.
Regarding content removal from what I saw in the modlog the most concerning action other than preventing people from talking about alternatives was removing the Alya-san Key Visuals. So that gives you a good baseline of what will get hammered if noticed: pretty much everything.
The defederation being grounds for removal of all mention is a bit silly but not a discussion I'm willing to go into here as it would be pretty off-topic. I repsect your opinion on the matter but imo it's a very slippery slope to ban talking about something outright.
To be pretty blunt here closing down here is more a formality than anything really, even just stat wise there are slightly more active users on the other instance and the users there are apparently a lot more engaged in discussion than people here.