On macOS and iOS — is just two dashes or alt+dash

I use it often, it’s not a dead giveaway of AI.

I would argue that your "enhanced" sentence is even MORE typical of AI. The first sounds like the style of a standard news article with a little corporate-speak, while the second is straight up head-of-marketing internal memo style.
Regardless, I agree that AI-detection can't really be automated or codified. But I don't think it matters. Bad writing is bad writing.