From the article
Microsoft has officially announced its intent to move security measures out of the kernel, following the Crowdstrike disaster a few short months ago. The removal of kernel access for security solutions would likely revolutionise running Windows games on the Steam Deck and other Linux systems.
My guess is that Microsoft wants provide some kind of kernel level anti-cheat, possibly directly integrated with directx, and it will use cryptography which will make it impossible to emulate with Wine/Proton.