I doubt a PR is going to be buried if it's useful, well designed, good code, etc, just because of this disclosure. Articulate how you used AI and I think you've met the author's intent.

If the PR has issues and requires more than superficial re-work to be acceptable, the authors don't want to spend time debugging code spit out by an AI tool. They're more willing to spend a cycle or two if the benefit is you learning (either generally as a dev or becoming more familiar with the project). If you can make clear that you created or understand the code end to end, then they're more likely to be willing to take these extra steps.

Seems pretty straightforward to me and thoughtful by the maintainers here.