That's why I said "somebody else, without looking at it". Clean-room reimplementation, if you like. The functionality is not forever unimplementable, it is only not implementable by merging this AI-generated PR.

It's similar to how I can't implement a feature by copying-and-pasting the obvious code from some commercially licensed project. But somebody else could write basically the same thing independently without knowing about the proprietary-license code, and that would be fine.

It follows the same reasoning as when someone purposefully copies code from a codebase into another where the license doesn't allow. Yes it might be the only viable solution, and most likely no one will ever know you copied it, but if you get found out most maintainers will not merge your PR.