It was also indexed by Bing.

I usually assume good faith, but in this particular case, I believe the chance that this repo was public before and the author just changed it to private to bait attention is far higher than that Bing/ChatGPT can actually read private repo on GitHub.

Not sure how it was able to read this user's repo name but for me, it's optimistically saying "yes they have a repo named X" of whatever I ask it and sometimes I do have that repo and sometimes I don't.

I have a private repo named "portland-things" and I asked "does this user have a repo related to portland?" and it responded with "yes it's called 'pdx'" but that's not correct at all.

Wow! This is the real news here!