Simple Classic Theme (fully supports Windows 8.1, 10 and 11)

It's not "the same":

The Windows Basic theme can only be enabled because it's the only theme that doesn't use hardware acceleration. So by disabling hardware acceleration (The DWM), one can activate this theme.

The Windows Classic theme also doesn't use hardware acceleration but is a theme implemented directly into the core of Windows. That means that by disabling themeing all together, the Windows core just straight up falls back to Windows Classic.

Windows Classic just works because all other things that need DWM can just use it. Since DWM is disabled with Windows Basic way more bugs come up because DWM is inaccessible. So for Windows Basic, a lot more patches are required to make your system even remotely "usable".

If you don't want any of that nonsense I would recommend something like this:

If you google a bit around you'll probably find something similar for Windows 10