He does it using his alternative to singular they: "Through personal conversations in recent years, I've learned to understand how sex with a child can harm per psychologically." Doesn't really seem sincere when he's grinding another axe at the same time. https://stallman.org/articles/genderless-pronouns.html

Another variant of his invented nomenclature besides per is perse which I'd rather not be called. It sounds like a child of purse and hearse.