r/GenderCritical was specifically the one place on Reddit where the fact that "sex is real" and "woman = adult human female" was openly promoted as a basis for understanding reality. If those facts can no longer be acknowledged on Reddit as simply and directly as that, then I don't think it's hyperbolic to call it "erasing women".

Yes, there were male-populated subreddits removed too. But I don't know of any that were specifically speaking to existence as a male in society and critiquing the law & culture around that. Maybe you know of some niche sub I'm unaware of, but r/GenderCritical was a flagship community.