Because one of the biggest hurdles to porting the Linux kernel and device-specific software to more hardware and making existing hardware work better is one of the things that "AI" can (seemingly, caveat) do surprisingly well?

Not to say PM (or any other project) should/shouldn't use AI. There are plenty of other salient reasons to reject AI. But given (from what I remember) postmarket's goal is basically saving as many phones from becoming ewaste as possible, well, an LLM could actually be a formidable way to get more hardware than ever running.