Isn't the metric that you've used "bugs per commit ~ per new line of code" going to miss the issue?

All code is technical debt.

If rsync releases used to have 500 lines changed and 5 bugs in and AI-powered rsync releases have 50000 lines and 500 bugs, it's the same bugs/line but much worse experience for the user?

I've not looked into the details of this case and I do use AI assistance coding at work but in my experience, the problem is that it's too easy to write lots of code and therefore hard to review the huge volumes of code and this analysis will ignore that?

edit: actually your table shows there weren't unusually large numbers of commits in this release, so perhaps my initial skepticism shows a bias I have?