whats wrong with this video?

You have indicated that your wife, under your guidance, could not apply this hold. I would respectfully suggest that you have demonstrated you do not know how it works or how to apply it. The discussion is academic.
:asian:

The strike/push to the upper arm/elbow does two things. It turns the opponent so he is not in a position to use a strike or kick against you. It also positions the arm and especially the wrist, so it can be more easily grasped and manipulated as K-man describes. That grab and positioning to apply pressure to the wrist would be more difficult otherwise. If you look closely at the video provided by Kung Fu Wang, you can see that is what is happening.
 
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