Yeah the patch 9 files were uploaded a few days ago to Steam DB. I thought that was common knowledge? It's obviously pre-release, so you can't download the patch. But the fact that it's being prepped = patch 9 for the anniversary.
I've never look at this folder but usually before a patch... the files are previously 4-6 weeks in "depot/branches". There is nothing in depot so I'm not sure what you have found mean anything... but I don't really know how steamdb works. It's just not as it has always been before a patch release.
