I think what Nicole was referring to is keeping the wrists really loose through the swing which allows them to hinge fully on the way back and unhinge fully on the way down.

I think most people start off with a good idea of setup and swing path but have locked/tight wrists and hands. So they hit weak slices as the wrists dont hinge properly on the way back and then the clubface doesnt release properly on the way forward. They then start aiming left to compensate, bringing them OTT, still with locked wrists. Now they pull slice (the one you see most hackers doing on a sunday). As they play more these players then try to swat with their hands to square the clubface. Most are still open and still coming OTT. This move is really inconsistent since again it is weak and relies heavily on timing

Finally they realise they have been playing with tight wrists and hands and learn to take the tension out and also the hands out of the release altogether by using body/upper arm rotation to square the club. This is the real breakthough in terms of distance and accuracy

I wonder if you can guess who was also one of these players this parable relates too