also, whats the science on that? does that even work?

I've looked this up before (admittedly it was kind of cursory) and from what I could tell the conclusion was that it doesn't seem to, that its apparent success cases seem to be from other factors (rehabilitation, gaming the diagnostic system, etc.) rather than the procedure itself having the desired effect. I don't really know what is true, but just wanted to mention it since you asked.

Anyway, I think you're correct in all of your assessments there. I'd even say federating with an anti-contact, anti-CSAM, anti-fantasy (etc.) instance would be worth considering once instances can be blocked, simply because they are trying to help people not be predators, but I can see why other people would be uncomfortable with such a thing. The instance in question, however, is not and cannot be any of those things and should be illegal to run.