This is Nyman all over again. BUILD bat drag into your students.....with the mechanics you teach.....then sell snake oil to fix it.
When your swing mechanics allow the suddenness of launch, that only comes from hand action, you're never hung out to dry at .6.
It is this.....

That was taught and is present here on the right....

.....Arm action.....Elbow through....external rotation of the humerus.....THE MAIN POINT OF TEWKS HITTING INSTRUCTION.....that causes the very problem he is looking to solve.
Cabrera uses his hands.
Forearm is more vertical. Pauses
Surely the swing hes teaching is not this bad? Your elbow is damn near ahead of your hands?