It's lazy, but IMO not for any of the subsequent narrative about media studies. It's lazy because the people were obviously already suffering from psychosis. ChatGPT didn't make them insane. They were already insane. Sane people do not believe ChatGPT when it tells them to jump off a roof! And insane people do insane things literally all the time. That's what it means to be insane.
The idea that ChatGPT convinced someone into being insane is, honestly, insane. Whatever merit one thinks Yudkowski had before this, this feels like a strong signal that he is now a crackpot.