I'd rather enforce a limit based on the number of PRs that account opened across all public repositories it doesn't have write access to within the last week. And PRs that were closed without getting merged should be held against the account somehow (perhaps via a "close as unwelcome" option for the maintainer).
This is a band-aid. Maybe even a good band-aid, because it'll keep individual contributors from flooring the zone. But the core problem is Github's model that assumes code is worth reading.
I'm much rather see the agent logs stapled to PRs. Make it easy to understand if there's a brain behind the suggested changes before engaging.
I also like the other features mentioned in the blog post. It won't make a difference to me and my daily work, but I'm glad that they are taking the criticisms seriously.
Though I have to admit that I'm a bit conflicted about this. Part of me also wants more people to move off of GitHub to help break their monopoly on code on the web, but I also don't want the people making and maintaining open source to give up their projects due to burnout and slop spam.
If <time> is set low enough, the noise still exists