Right? It’s the obvious question:

why are they using software to detect software?

I can detect AI written prose in less than five seconds; I would expect a trained teacher to be able to do that as well.

You know you can't just say "I detect AI written prose" and then do whatever you want about it, right? It's not difficult, sure, to detect it. It's difficult to prove that it's true and then punish the student for it.