Shu's PS4 had to be in suspend mode, if you notice when he starts playing Shadow Fall he never chose a class. Unless it automatically chooses a class for you.
There are more clues that his game was just suspended during that live demo. His gun clip was already partially empty once he starts playing. Also, he only makes one kill (a melee) but gets a "Kill streak of 5" challenge notice. These things can be seen in the Gamersyde HD version.
However, the match itself was real as was the screenshot he took using the share button and shared on Twitter. I was able to find the exact frame in the Gamersyde video where he took the screenshot.
I was going to make a YouTube video about this but never got around to it.