But to my eyes, this PR does look like spam. It has no description, its title and commit messages are meaningless. Changing random auxiliary files is also a common sign of PR spam. This PR really looks no different from other spam PRs that popular GH repos have to deal with all the time.
This is not the right way to contribute to a project. If I were the maintainer, I wouldn't engage with it either, just like I don't reply to spam emails.
Your spam detector is broken. It was opened by an account that's clearly human with more than 10 years of history. It was closed by the author themselves 2 hours after they opened it. It's got WIP commits that were clearly written by a human thinking through the process.
What about this reads as spam to you? They just forgot to fill the description portion of the PR
This is not the right way to contribute to a project. If I were the maintainer, I wouldn't engage with it either, just like I don't reply to spam emails.