FYI: the author is named Isabella and AFAICT uses female pronouns. In light of that, the amount of "he" and "him" in the comments so far seems a bit excessive. EDIT: it looks like a lot of those comments have been cleaned up or deleted since I first made this comment. Thank you.
It’s xe/xyr according to the linked Twitter profile.
https://cppcast.com/guest/imuerte/
which uses she/her. I guess it has changed over time. In either case, male pronouns (or "this guy" in one still-extant comment) are incorrect and seem like the result of stereotyping or opposition to modern gender reality.