Correct,very few of their practice swings TTB. They don't supinate the rear forearm in their practice swings either.
But the motion they practice is forced.
Alternatively, the young lady is merely putting the bat into the position and rotating her core and the centrifugal force rotates the barrel around her hand. Efficient transfer of rotational energy.
TRY IT!
The only thing the pros avoid on purpose is supination of the rear forearm on practice and game swings.. Forced supination voids trying to hit the top of the ball they all speak of. Try viewing the barrel movement as it changes direction instead of attempting to turn it.
Also notice during the change in barrel direction the hands become free to get into position to whip the barrel based on what the pitch calls for.
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