Just a couple of points:
1- # "Axiclosing" (grip roll) - the spin of the grip around the long axis of the club....
I don’t know many who studied TGM that spins the grip. That would be poor hand manipulation of the clubhead. A Horizontal Hinge Action does close the clubface and is done naturally in a Swing Stroke procedure. But not for the reason you or the author believes. The clubface appears to close and does when viewed along the plane line but stays relatively square to the circle of the swing. It does close shut with a small subtle move of the left wrist after impact (taught- learned and executed every time a use a Swing Stroke) to re-align the shaft with the swing plane going into the follow through. The pivot and the Pace of the stroke, a long roll moves the shaft a quarter turn, (not quite a spin is it?), not the hands. Hands are educated clamps.
2- # "Circumclosing" - the natural kinematics of clubhead motion. The clubface passively closes during the its downward motion at the bottom of the swing plane.
First- kinda of a strange word Circumclosing, isn’t it? Circumferences are closed ended already, aren’t they? Maybe Circumcontinuing might be a better ‘word.’ The clubface remains on plane throughout the Impact interval, the circumference is already closed. In a Swing Stroke, the clubface strikes open, squares and closes on the plane- “circumcontinuing”
part two:
Below is a simulation illustrating clubs designed for (top to bottom) a vertical swing plane, a slanted swing plane and a horizontal swing plane. The pivot (red) is a hinge to turn the club in a plane. Only the club designed for a vertical swing plane does not turn its clubface as the swing progresses. Otherwise, when the swing is fully horizontal or in between horizontal and vertical (slanted), the clubface will be circumclosing.
Believe it or not, each club is doing the exact same thing because the illustration shows the clubface remaining on the swing plane circle. The extreme up right club, the normal golf club and the spatula are all circumcontinuing.
And finally
* Golf uses slanted clubs designed for slanted swing planes.
hahahah so this was pure. This was just to remind us of club design?
* This means that for all golf swings, there is an automatic closing of the clubface during the downswing.
Okay the meat. Yes you are right, the clubface will close in relation to the plane line when swung in a circle while remaining on the incline swing plane. That is the reason clubs are designed the way they are.
But, no, dead wrong if you believe that it occurs in all golf strokes. A simple Angled Hinge action used in Hitting and naturally in the Hit Stroke, does not close but remains open and lay- backed as it drive off plane line. It circumcontinues open and in a lay-backed position. And this is because the hands didn’t roll- they held to a no roll feel.
The big deference in what you think a swing stroke can do and what anyone you learned TGM is that TGM golfers can control the clubface with three hinge motions that require little or no hand manipulation. Why? Because we know our geometry of a circle and how the clubface moves on it.
A spatula? Come on.
The kinematic study makes a detailed analysis of a variety of problems due to erroneous hand action. The statement you refer to should be strictly taken in the context defined by the pics.