Looked at the clip about 8 times, smooth of both sides, might be ambidextrous. All comes down to the hand switch; if you're quick enough, no more B-Hands!! Used to play inline-street hockey over at Central Park/72 St, and guys would always give me sh#t about switching, ... until they finally figured out it actually worked(at least in my case)
You can tell from the pop the RH is more sound. Freer release into the ball. The LH is good too but not that same smack into the ball. He just needs to learn to serve RH to deuce court and LH to ad court. That would really screw people up.
he does have a weak semi western grip on the right side with more extension on follow through but has a strong semi western grip on the left side with more of the windshield wiper motion... I think.