If he uses Facebook at all or has no problem doing so (not like any big tech account is better tbh) then I'd just say go for an Oculus Quest 2, you simply cannot beat that price for what it offers in screen/lens quality, build quality, resolution, tracking quality without external sensors, controller quality as Oculus still have the best controllers and easiest setup and their api is more supported than WMR (but SteamVR/OpenXR still reigns supreme and works with everything, potential hiccups aside), plus the better PC VR games can be pretty demanding like any PC game (edit: but that system is pretty beast so is gonna be fine for sure) so he at least gets to play the better stand alone stuff in good form using it like a console in that case, also sharing it around the house regardless of where the PC is etc. You're just gonna have to also find a good USB cable to buy to use it with PC VR games, there are homebrew wireless software solutions but that all depends on where the router/PC/Quest will be and all that stuff, it's not gonna be reliable for everyone, don't buy in wireless hype as the be all end all (yet).