Forza 7 looks like crap in that video for something that is supposed to be max settings on PC. The demo looked better when I played it on PC.
It's true for most of games due to Youtube compression.
Also framerate drops?
Played on a GTX1080 according to the author of the video. Maybe some drivers issues ? He also said this : "I played a ton of the GT Sport beta and a few hours of Forza 7, not really impressed with the Forza 7 visuals tbh....cars look toy like and this track looks far better on GT Sport"
And honestly, we can't disagree with him based on his video.