[YodasLuke]

Bray

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.
Jeff.

"Only" is a very exclusive word. Highlighted (by me) in red is a small point but an important one. The location of the fulcrum (the Left Shoulder) is much more important than the location of the foot, when considering the possibility of an upward strike. For example, I could position the ball inside my foot and outside my Left Shoulder (very wide stance and/or too much axis tilt at Address), and I'd have the ability to strike the ball with an ascending blow. In contrast, I could have the ball outside of my left foot and still catch the ball with a descending blow. It would require a forward leaning spine and/or a very narrow stance. Either scenario could place my left shoulder forward of the ball.

The following pictures are from the same frame (7 frames post Impact). The 2nd picture is zooming in on my hands, just to echo the ability of the Right Wrist to remain bent post Impact.