It's commonly thought (and obvious) that Yud wrote the book about himself so I doubt it. It doesn't really fit the rationalist playbook either, they take themselves excessively seriously.
The character's author-insert aspects are self-parody.
He's too fragile and prone to overcompensation for that, nice try. Of course he's going to back track after getting mercilessly mocked for it and then claim it was just a joke.
The first few chapters have a song scene parodying ghostbusters and a joke about the protagonist biting a teacher in a tantrum as a young kid. There's plenty of elements of crackfic parody in it.
> a joke about the protagonist biting a teacher in a tantrum as a young kid.
wasn't that literally Yudkowsky, tho
Not disagreeing that Harry in the story is an author self-insert, just with that it's a fully self-serious non-parody one.