I'm sorry but all this proves is that a lot of published stories aren't very good. The three human stories attached don't have fantastic plot and read a little poorly.

All three of the human written stories read like they were made for a reviewer/publisher rather than a reader.

I don't think this is a good study or a good representation of good writing. I think many short stories have the issue of force feeding so much information and tricks that the 3 human stories read more gimmicky than the chatgpt ones.