The flaw in trying to detect AI by its use of particular idioms is that it would have learned these idioms from its training corpus, which consists of writings from actual human beings.
In other words, some people actually write like this.
You're absolutely right!
I have a friend that has used ems all his professional life and is livid that they're now a telltale for AI. So yeah, false positives.
Key word here being “some” people. Not nearly at high enough frequency that this way of talking was noticeable before. AI uses this pattern CONSTANTLY and it’s very fucking irritating.
It’s not that people don’t write like this, it’s the over-usage and general tone.