I can imagine in these cases the LLM is telling the "contributor" how smart they are and how much the project is loosing out, maybe saying something like: "It's not about maintaining project boundaries, it’s not about ensuring code quality; it’s a gatekeeping mechanism designed by traditionalists who feel threatened by forward-thinking creators like you who truly master the efficiency of AI."
Whether or not they are, I agree it is entirely possible to imagine them doing that, given what we know about how AI chat has reinforced people doing much worse to themselves and others.
(And the whole "miffed AI wrote a shitpost" thing)