Behind the scenes, I'm 99% confident that Google has deployed AI detection tools and will monitor for it.
That said, unless all the AI generators agree on a way to add an unalterable marker that something is generated, at one point it may become undetectable. May.
I'm not aware of any AI detection tools that are actually effective enough to be interesting. Perhaps Google has some super-secret method that works, but I rather doubt it. If they did, I think they'd be trumpeting it from the hilltops.
That said, unless all the AI generators agree on a way to add an unalterable marker that something is generated, at one point it may become undetectable. May.