There is still a sampling bias if you compare blanket human written repos. I would guess people are far more likely to share their homework assignments, experiments, hackathon results, weekend toys, etc. as a public repo if they put some amount of work into it. I would guess minority of those would get any stars at all. If the whole thing was generated by AI in less then 20 minutes, I would guess they are more likely to simply throw it away when they are done with it.

Personally I think comparing github stars is always going to be a fraught metric.