[Mike O]

From my reading of the TGM book, I gather the impression that HK believed that the club released in the downswing because of a change in direction of movement of the hands from a straight line path to a curved path (that would not be the case- you've mis-interpreted/mis-represented Homer Kelley's concept of release. In his book section 7-20/ 10-20 he gives some ideas of what releases the "power accumulators"), and that the endless belt model explains the release phenomenon.

Note that the hand path in both these images is near-circular, and there is no straight line path. Therefore, "reality" doesn't support HK's endless belt concept as explaining the release phenomenon. (Here again, you haven't understood his concept and therefore arrived at an inaccurate statement)
Surely, a much better explanation is this mathematical model, which demonstrates that the club develops angular acceleration at all time points in the downswing when the pull on the grip is at an angle to the COG of the clubshaft.

http://nmgolfscience.tripod.com/release.htm
That explanation is either really terribly written or definitely has a minimum of a couple of errors in it. I wouldn't rely on much information from that "site".

Jeff.

Jeff,
Some brief comments are bolded above in relation to your post. Also, by the link that the author has for basic physics I would presume that the author doesn't "believe" or isn't capable of explaining the concept centrifugal force- another reason to question the degree of intellectual acumen of the author.