"Of course, the conventional wisdom has always been, and remains so now, that there should be a weight shift to the trail side during the backswing. Did Mindy have special insight on this matter that still hasn't been discovered or accepted by mainstream golf instruction?"
All I can surmise is that when the arms and club go right in a wide arc then something has to go left if you wish to maintain your balance between your feet. Otherwise it's right foot, left foot.
"Trebuchet: a medieval military engine for hurling heavy missiles (as rocks). Do you (somehow) see a connection between a trebuchet and keeping the weight balanced between the feet during a golf backswing? Jim"
I don't know. It just looks like a counterweight butt from certain angles. Hogan did it too.