That link you gave is interesting.

My take on it is that you would get the exact same effect if 5 human writers happened to become elevated above all other writers in popularity. Then people would notice their tendencies and hate on them, "those damn big 5 human writers always use simile rather than metaphor", or whatever. I guess what i'm trying to say, is that we are annoyed by the tendency of just 5 specific LLM writers, who have the very human characteristic of having biases, tendencies, and crutches that they overuse.