This post describes the experience of a user (whose pronouns happen to be similar to mine). The pronouns were a derivative of the user name. To sum up the post, these pronouns were removed from this users profile, and an about me from one Stack Exchange site was copied over to all Stack Exchange sites, including those sites where the user had an anonymized profile.
Those are not pronouns (grammatically speaking). It's just someone who doesn't want to be referred by standard pronouns or neo-pronouns. Which is OK, but Peilonrayzthis person should know it looks extremely similar to the Attack Helicopter 'meme'. Instead, Peilonrayzthis person should save Peilonrayzelfthis personself the trouble and not making up pronouns on the fly. That only serves to further intrigue the Stack Exchange community.