Agreed; the frontier models have gotten remarkably good at these sorts of analyses. I write fiction using AI, and I have a very involved process of humanization (remove AI tics, etc.) including running an ensemble of AI models, and it's pretty remarkable what they turn up. Note: I always mark the works as AI generated; my goal is to have good stories, not deceive.

Interesting. Can your work be read online? What is the process you use to write fiction using AI?