Hi Brian
sorry but i don't buy that, as you swing your driver down to the ball there and many forces at work, the bend in the shaft the delay in your wrists all change the force to some extent and your body happens to measure all these and adjusts as required and all in a few milliseconds.
every time you change your club you would have different feeling and forces to work with and you do all this without realizing all the complected adjustments that your hands and arms are doing and doing this with a light grip so you only grip the club hard enough for the club not to turn in your hands???? and apply that to only the muscles that need to be used in countering the force.
it is my opinion he is wrong with how he works out what happens and he says there is 100lbs of force but it only happens for a slit second so you don't notice it but even for a slit second you would need to have a really tight grip at hold to to as he says a "sack of cement".
you said that the force pulls the arms away from the body but the force don't start to take effect till the hands are below the hips and the club started to straiten out so how does the muscles know to pull back if your already well into your swing plane, the force is in the hand to below the waist and only when the club starts to catch up with the hand if the force applied to the club head.
in "the golf machine" it explains the forces a lot better and how and where they are applied.
cheers
bill

__________________
ping zing2 metal driver
ping zing2 metal 3 wood
ping eye2 1 iron
ping zing2 3/9 irons
ping ist 47% wedge
ping zing2 52% s/wedge
ping mb 56% wedge
ping c10 G2I broom handled putter
top flight "T" golf balls