Chances are MS is still tracking you via TPM and/or hw/peripherals.
I can't not register Windows 11, because despite everything I try to erase my hardware footprint, it still ties it to my digital license.
This goes as far as upgrading every single piece of hardware on my PC, and using an entirely different ISP.
And no. I don't use any Microsoft services on Win 11. I don't use Internet in any capacity when installing. Nor do I use any cd keys for Windows.
Everything the installer asks me, I answer "No." to.
This should honestly be a huge privacy concern but alas.
It's more so lucky that there was someone diligently doing that. It could've easily gone unnoticed had there not been someone like him.