If they have real studios using it I'm guessing this just means plug and play HDR support? As opposed some previously working set up requiring tweaking it yourself?
To my knowledge, there was no working HDR of any kind until the last year, when Valve hacked in hardware-specific HDR into Gamescope, and even that only works if you really get your hands dirty.
Last month there was a hackathon with all the big players (Valve, AMD, Nvidia, KDE, Red Hat, Wayland) to finally settle on a plan for universal compositor HDR implementation.
No, HDR basically doesn't exist on Linux at this stage. I believe there's some (insufficient) scaffolding in the kernel for it, but no support in the common display stacks.
Last month there was a hackathon with all the big players (Valve, AMD, Nvidia, KDE, Red Hat, Wayland) to finally settle on a plan for universal compositor HDR implementation.