Its a community that started or has emerged around the porting of windows 10/11 onto the nokia lumia 950.
Now there are a handful of snapdragon (especially 845) devices supported.
In my understanding the key was some sort of hack to get a uefi running on those chips. Also if i am right the drivers are reverse engineered or other known drivers were modified. I am not sure about the documentation of those.
The website also has a chapter dedicated to linux but it seems quite empty.