[floatboth]

That's just some list in the documentation, mostly intended for OEMs building new computers with pre-installed Windows.

NO WAY there will be literal cpuid checks excluding earlier processors.

[vetinari]

This is not the Windows Logo program, which is intended for OEMs.

There do not need to be any CPUID checks to exclude processors; just a random update will not work and Microsoft will shrug it off, well, that CPU is not on the supported list anyway.