If you either know a bit about permutations or have done some SIMD programming before, you should be able to see exactly what he's doing (except for the finale) and, well, he's not lying.

All you need to do to perform most of this trick yourself is to grind perfect (Faro) shuffles (split deck exactly in half, then a riffle shuffle that perfectly alternates cards between the halves) in hand to the point where you can do 3 in a row reliably. Smoothly, in seconds. In front of an audience.