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> Note that if you are reading this file from a Git checkout or the main LLVM web page, this document applies to the next release, not the current one. To see the release notes for a specific release, please see the releases page.

That seems to indicate that it’s a work in progress and someone forgot to do a cleanup process for things that didn’t change.

It does look like they missed the "write release notes" part of the release playbook. ...does LLVM have a release playbook? Is it public?

Yeah, the whole page reads like a draft

Yes, I suspect the release notes are still being worked on. Or at least, I never noticed these sort of statements in the past.