Then the comment can be removed, as is duplicate of code and has no use.

However, it might be trained on code with erroneous comments, either because it was mangled by a merge or because it's outdated. The more times this happen, the more confused the AI model will be.

Which makes me to think that the AI models should be trained on the code evolution of commit chains and not just on isolated snippets of code. That way, the AI could analyze your own commits to detect when a comment becomes outdated.

I'd settle for AST-aware merge. That also fixes comments not glued to code they were attached to before