More recently, from Phoronix:

While the initial driver patches were merged to char/misc and now in turn within Linux 6.10 Git, much of the enablement work wasn’t accepted in time. Thus for Linux 6.10 the new NTSYNC driver is marked as “broken”, so it won’t even be built for normal kernel builds.

Hopefully for Linux 6.11 or sometime soon the rest of the NTSYNC patches are upstreamed for yielding this massive boost to Windows games on Linux.