Not exactly, they train it on 2000 hours of labeled video (they have people play the game and record the inputs at the same time) and then use those 2000 hours

Not exactly, they train it on 2000 hours of labeled video (they have people play the game and record the inputs at the same time) and then use those 2000 hours to figure out the inputs of the 70000 hours of unlabeled video. Then it uses all data to play the game by itself using a video feed.