I seriously hate the supposed "tells" for LLM writing. Can't use delve, em dash is suspect, never get a fact wrong, and God forbid your sentence structure is more complex than what a 3rd grader is capable of.

I think we're well beyond the point where the majority of people cannot tell what is actually produced by an LLM and we're convincing ourselves we still have a handle on the situation. A lot of these rules are completely arbitrary and vary from person to person.