Reviewing post history, it's very clearly tongue-in-cheek. The user probably spends time in spaces that shit on incels and the like and is adopting the name ironically.
Out of curiosity I tried doing it to itself, and googled pooner schism. Which google ai confidently explained was a schism on /lgbt/ about pooner memes. Now kinda curious whether it's a hallucination or not and I'm kinda scared of diving deep enough into this rabbit hole to find out.