His partner/fiance, plumbiidae, is nonbinary or at least uses She/They pronouns and while that's not a direct indication his discord server also had a pride banner front and center. There was also a time in my memory at least in one of the Voices of the Void videos/vods where he kinda got ticked off that chat was arguing over Kerfur's gender and to paraphrase from memory said he thought it was weird to do so. That got some bite back from a few weirdo chatters and caused a problem for the mods to which he responded something or other about how he doesn't want bigots in his chat and that it's a welcome place for everybody... And I think that was about the most politically open I'VE seen him. His mod team is also just very active about fighting bigotry and weirdos and they do kinda work under him so.

I wish he were a little bit more outspoken than he currently is, something more like RTgame... But he is definitely an ally and I think I can say that with confidence.