The year was indeed 2015, and his political content would fit OP's description, but the reason for the ban was that he was repeatedly being a total asshole, not "YC is scared of anti-fascists".
You know... one of the charges leveled at Michael was creation of sockpuppet accounts in various media (Wikipedia, HN, Quora). I suppose it could be within the realm of possibility that this is another one of these, given the oddly specific example in the middle of general musings. The fact that all follow-on replies have to do with this particular incident and nothing else in the post, painting the victim in the most positive light, makes this especially questionable. If I'm wrong, I apologize and wish the OP well, but I gotta say, it looks pretty sus to this observer.
MOC used role accounts on Wikipedia, which was considered acceptable for a while, but refused to stop using them and was banned. There's no evidence at all that he used sock puppets here or on Quora, and a strong case to be made that he didn't.
YC found no drugs, no infidelity, no criminal behavior, no unethical business dealings. All they found was... weird posts online in the 2000s.
The year was indeed 2015, and his political content would fit OP's description, but the reason for the ban was that he was repeatedly being a total asshole, not "YC is scared of anti-fascists".