[Yoda]

How do we keep the Belt Speed/Hand Speed constant during Release? Swingers use Momentum Transfer, Hitters use Right Arm Thrust. One is more effective than the other.

Momentum Transfer is indeed more effective than Right Triceps Thrust in terms of minimizing Release Deceleration. And all other things being equal, that would result in a lower Clubhead Speed at Impact.

But...'all other things' are not equal. The Right Triceps Muscle Power is capable of producing tremendous Hand Speed, perhaps exceeding that of Momentum Transfer Centrifugal Power. Therefore, even after the Release Slowdown, it is possible for the Hitter's net Handspeed to be equal to (or even greater than) that of the Swinger.

In my 1982 GSEM Certification Class, Homer Kelley illustrated that point using Release illustrations from Search For The Perfect Swing, a book published the year prior to The Golfing Machine.