I think in this case it's not about signalling: in the linked discussion they are saying that the problem is the workload created by the AI-assisted creations, not the AI use in and of itself, and they are open to relaxing the restriction in future once they can figure out how to manage it.

(The issue is, I think, if you allow AI, no matter how many paragraphs you write about taking responsibility and ensuring high quality contributions, you're gonna get a lot of bad ones just because by sheer volume there's enough people who aren't gonna read it, and that's gonna take a disproportionate amount of effort to filter out).