That number shows across all versions, regardless if they have been patched or mitigated
If you look on that site at current versions only it looks very different
iOS 18 - 30
iOS 18.1 beta - 0
macOS 11.2.3 - 0
Windows 11 22h2 current patch - 0
Fedora 41 - 1
Android 15 - 7
Ubuntu 23.10 - 2 (for some reason 24.04 and 24.10 are missing)
It's a pretty interesting site!