[O.B.Left]

In my opinion Arnie loaded his Lag Pressure Point at the Non Rotated location ( the index finger). See 6-H-0 but remember it is distinguishing between true Swinging and Drive Loading as opposed to Hitting general ( condider the hitter who employs a Swingers Drag Loading in Start Down for instance who might load the Rotated lag Pressure Point)

I think Arnie did drag load and Delay his release. Release of his Active Right Elbow, Hitting, although he has a lot of #2 angle as well. A Non Auto Right Arm Throw, non Sequenced simultaneous Release. He Drives Out with a strong sense of Lag Pressure at #3 pp on the Index Finger, on the Aft of the Shaft. Giving him a desire to load same on the way back.

His Arched Left Wrist is nuance and off plane perhaps but is often seen in golfers who load the finger hard in strart up with a tendency to wag it under plane like Raymond Floyd or Nancy Lopez.

He's loaded the #3 pp at the location consistent with his Release Throw. At the first joint in the right index finger. His drag loading will tend to move it to the Rotated Position and load the #2 perhaps ..... A complication Homer wasn't fond of.

Armies 4B Hitting in short. I think, maybe.

Bucket his arch could change his right forearm position a tad but I concur with youre observation. He's supporting the direction of loading , against the #3 at the first joint in anticipation of his drive out action against the aft of the shaft.