He just deals the 4 aces of the bottom. What's not to get
But the 4 aces are not there, nor on top, when the cards are spread on the table.
I believe your best bet may be to look into Ed Marlo's Miracle Spread. I learned it from The Classic Magic of Larry Jennings but I also believe it is in Marlo's The Cardician. That move could easily replicate what Jason did.
C