I don't see what is really wrong. He has a bent right wrist and flat left at impact and the a full roll after. His right hand probably comes off because he rolls so hard thru and doesn't hold on with his right hand.
I don't see how you can tell from that pic if there isn't a hinge action. He's one of the best ball strikers on tour. I think I would take his action any day of the week.
PS. VJ doesn't have to practice that much to stay as good as he is. He is just a perfectionist.
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