Yes it's less efficient and reliable than regular Doom, but it's not just limited to Doom. You could have it simulate a very graphically advanced game that barely runs on current hardware and it would run at the exact same speed as Doom.
Technically this is correct, but in order for this to work you have to
1: Build the entire game first
2: Record agents playing hundreds/thousands/millions of hours of it
3: Be able to run the simulation at far higher resolution than what's in the demo videos here for it to even matter that the hypothetical game is 'very graphically advanced'
This is the most impractical way yet invented to 'play' a game.
