Eh, the whole em dash thing is a low accuracy tell. Most of my writing uses em dashes; iOS/macOS replaces "--" (dash dash) with an em dash. Fwiw, in your example, an em dash is the correct choice, not a dash.

Ran this through a few AI-detection analyzers and, yeah, it's being pegged as AI-written. I'm guessing the author used it to do a final tidying up (not that I think that's acceptable- just proof-read your work) and the em dashes came out in force.