Don't use that script after the latest update! Explorer will go into an infinite reload loop!
Currently, as of Windows 11 build 22621.1344, it appears that installing StartAllBack, is the only viable option to go back to the Windows 10 style ribbon in Explorer.
Edit: ExplorerPatcher 22621.1344.53.1 was released today. It should now be compatible with Windows 11 22621.1344 and provides another option for getting back the Windows 10 ribbon.