IMO this is sane and well worded, I am bookmarking this as wording more projects should at least consider.
But I think they need to expand on the response to vibe codes PRs and such. Getting flooded with this is extremely damaging to a project, so I think their response should be quite strong; immediately close vibe coded PRs, walls of slop, and such, and have a low bar for banning the submitters/spammers behind them.
It’s kind of like spam on the Fediverse. Best to take an extremely aggressive approach as a “deterrent” lest spammers collectively decide its fertile ground.