That is a better stance than most AI-accepting projects, and while I think with that method Cosmic will avoid unskilled vibe coded pull requests, it is ultimately permissive or tolerant of some level of Corporate LLM contribution, even if small.
In effect, that means potential contributors have little incentive from the project itself not to use corporate AI, with all the environmental and social problems they bring. It also still opens up S76 to potential legal issues down the road if any of those higher quality LLM contributions that don't need to be re-written happen to include copyrighted code from the AI's training data (which, as a profitable business, I would've thought S76 would be particularly wary of).
Personally, I'd love to see a policy that doesn't allow code from any corporate AI's, and instead only allows code contributions from self-hosted AI's that were carefully trained on truly public domain code (which does not currently exist, as even the ethical Swiss AI attempt is pretty flawed, but perhaps someday an effort like that is successful). Gentoo has such a policy now.
It is expressly forbidden to contribute to Gentoo any content that has been created with the assistance of Natural Language Processing artificial intelligence tools. This motion can be revisited, should a case be made for such a tool that does not pose copyright, ethical and quality concerns.