"6. Maintain Wrist extension into and through the hitting zone.
To ensure the lag can be used to improve the hit."
I feel like this is vague and not necessarily true.
I personally believe that the correct way to use the hand is to initiate wrist abduction into a neutral wrist from the wrist lag position as you contact the ball. I don't understand the congruency of generating power to transfer "hips-shoulder-hand" and leaving your wrist extended through the hitting zone.
Please let me know if I'm wrong and if I'm perhaps just misunderstanding what is written. Thank you.
Also the capital W in wrist on step six seems to be a typo.