I've been over there a bit.
I'd say yes, it's becoming like that and no, it's not there yet. Check out the infractions thread on RPG.net--they ban people for mocking the Protocols of the Elders of Zion in an insufficiently rabid way, calling Narrangasett an English name (it is in fact not English but Native American, but a ban?), and various other things that read like a parody of tumblr.
I tend to stay out of these discussions on there though, thinking about it, maybe I should push back a little until they ban me. From what I can see they actually allow you to delete your account, unlike RPG.net which refuses to, probably so they can keep everything you said to mine for blackmail material if they can figure out who you really are.
Interestingly, apparently the guy who started the thread, after specifically asking about how to make a more inclusive OSR game, mentioned when asked that he has been pushed out of RPG.net. So Big Purple's hypercensoriousness isn't just political...they've got a severe case of generic love of the banhammer as well. (This does describe most of the woke left as well, BTW.)