I'm not sure if it is that game, but if it was, they might very well be using the "Remote Play" functionality, which streams the game from the console to a PC o

I'm not sure if it is that game, but if it was, they might very well be using the "Remote Play" functionality, which streams the game from the console to a PC or Mac. You'd definitely need a beefy eGPU to decode all those pre-rendered images ;-)