This is a super interesting project, and the video is really well presented and explained, if you prefer that format.
I think this method could be brought even further by using ‘thin clients’ (a cheap laptop or used office mini-PC), making it possible to access the main gaming rig from any room in the house as long as you have access to a good network speed.
Utilizing a ‘dummy’ HDMI or Displayport stick, which simulates a monitor for the GPU, you could then remote into the gaming rig from a thin client-like PC through Parsec or Moonline/Sunlight, allowing you to use it as a fully fledged gaming or workstation PC.
If anyone decides to go that route, be aware that AMD GPU’s have pretty notoriously bad encoders/decoders, so I’d recommend sticking with Nvidia or Intel GPU’s.
AMD used to be the shit on Linux a decade ago, much better support than Nvidia. It looks like something changed, but I only use discrete intel GPUs so I’m way out of the loop.