Wow I'm surprised. I found this to be awesome all around. As far as I can tell, he is not reading, so I think he just knows the music and feels it. I think it adds so much to the music, but to each their own.
Vadrum is just following what others have done.Ted Kirkpatrick from Tourniquet did stuff like that years and years ago.
this is just one example, I think newer though:
Check out i.e. "K517" on the album "Vanishing Lessons" by Tourniquet,
from the nineties.
Not to take anything away from Andrea, but he sure isn't the first to do stuff