Hands controlled pivot:
The whole point with this expression is that ideally you want your pivot to work as an extension of your hands.
When you pick up an object from the ground with your hand you:
- aim for the object
- bend your hips
- bend your knees
- lower your upper body
- straighten your right arm according to aiming point procedure, straight towards the object
- straighten each of your fingers in a simultaneous straigthening procedure, called open your hand. This must happen before the hand has reached the object
- place your hand right above the object
- bend all your fingers around the object - the picking up procedure
- and so on
But if you apply a hands controlled procedure to do this you simply pick the object up with your hand without thinking about every little detail every part of your body must contribute to.
Equally, when you apply a hands controlled procedure in golf, you either hit the ball or swing at the ball with deliberate hands. Most things pivot related happens as a response to your hands but even if you have one or two pivot related swing keys you think of.
So hands controlled pivot has a lot to do with how your ball striking skills are organised in your brain. But there has to be some mechanical backup too.
Pivot controlled hands: The golfer either has focus on the pivot and / or the pattern is such that the hands aren't able to what you want them to do. For instance an involuntary flip release.
Pure speculation from my side but: I think a lot of golfers who struggle to take their swing from the range to the course do so because they play pivot controlled hands on the range, but when they get on the course they bring a hands controlled mindset that is not compatible with the stroke pattern they have rehersed.