Apart from the external person turning out having experience with zig and macos (but not on developing terminals and rendering stuff), this is a good imo example of what ai can be used well for: writing one-off code/tools for which it is enough that it is just working (even if not perfectly), but one does not really care about maintaining, because it is meant to be used only on a specific occasion/context. In this case, the external person was smart enough to use AI to identify the problems and not to produce "fixes" to send as a PR.

Imo, an issue is that the majority of people who submit AI slop as PRs have different motivations than this person (developing a PR portfolio whatever that may mean), or are much less competent and eager to do actual work themselves (which AI use can worsen).