I am not sure how nerdy we need to be about this but:
First of all, Daryl, there's a big IF in the quote you used....
Further, there is no 1:1 relationship between lag pressure and club head acceleration. There is a 1:1 relationship between how much you work you put in and acceleration, but work is also depending on how much you move the lag pressure point. Work = Force x Distance. In this case distance will be a function of hands speed. If you push something and it doesn't move, you're not accelerating anything. The more the pressure point moves, the more energy you put into the club, for a given lag pressure.
So for instance, assume that the distance/ hands speed doubles between the middle of the release and impact, while the lag pressure is halved. The acceleration will be the same.
I'm not saying that this is the case, just trying to get the physics right here.
There are some ergonomical advantages early in the down stroke and disadvantages towards impact that makes it practically impossible to apply the same, high effort throughout the down stroke. Also, as speed and radius increases towards impact, the MOI of the whole golf swing will increase. And the golfer is forced to use an increasing percentage of his efforts on simply holding on to the club to keep it in orbit.
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