You are correct to state that the right wrist remains bent post-impact and that it would be theoretically possible to hit up on the ball with a bent right wrist. However, that would only be possible if the ball was teed up well ahead of the left foot on a high tee. Also, the hands (despite a bent right wrist) would be angled forwards at that time point and not be angled backwards.
Look at these photos of Tiger Woods. He maintains a bent right wrist throughout the followthrough phase of the swing - and he could theoretically hit upwards with his driver if he teed the ball more forwards - see image 2.
In image 2, it would be possible to hit up on a teed ball if the ball was placed on a long tee at that point - where the clubhead is located. However, his hands would not be angled backwards or be vertical (despite the bent right wrist) at impact. The hands would be angled forwards.
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