I wouldn't call this photorealistic, it's more like a poor tinted dashcam realistic. It's impressive that it's happening real time etc., but just looks really bad and the colors are off just like in a dashcam video.
Did you watch through to the end of the video? They show an example of using a different dataset, and it looks much less like a dashcam. I'm amazed by the results.
Alternate title: GTA V made to look like GTA IV by new machine learning model :)