I'm just putting this here for posterity, because it doesn't really matter as Apple has obviously decided not to support their original tech specs and instead just change them. But for what its worth, if you look at the page snapshot from archive.org on November 4th, 2024 the System Requirements said "Bluetooth-enabled Mac with OS X 10.11 or later". Then if you look at the snapshot from November 18th, 2024 the System Requirements were updated to say "Mac with macOS 15.1 or later", which is what it says today on the live site. So at some point during that two week period, I'm guessing someone at Apple noticed that there was a compatibility issue (possibly because of this post), and instead of pushing out an update to support their original system requirements, they just quietly updated the listing. That's super frustrating for people who have a company computer that is update locked to an older version, but I doubt they will do anything more to support older machines.
https://files.mastodon.online/media_attachments/files/114/256/864/708/132/285/original/6c9ce2e5421af948.png