[Weightshift]

"prior to the low point of the Downstroke" can be regarded as "prior to the shaft being in-line with the leading arm", which also means "prior to release (throwaway)" when the pivot is vertical to the ground.

The clubhead can pass the low point and start to move upward (relative to the level ground) at impact "prior to the shaft being in-line with the leading arm" or "prior to release (throwaway)" when the pivot is tilted away from the target. The ball needs to be teed up to allow the above to happen without hitting it fat.

Hackers usually hit the ball "after the shaft passing the in-line condition with the leading arm" or "after release (throwaway)", regardless of pivot position.

I may be sticking my neck out here, especially after seeing the renowned EdZ praise your post, but quite honestly I don't understand your reply.

(1)"prior to the low point of the downstroke"
- means only one thing to me, exactly what it says.

(2)"The clubhead can pass the low point and start to move upward (relative to the level ground) at impact"
- suggests that impact occurs after low point, which is totally contrary to Homer's writings.

(3)"when the pivot is tilted away from the target"
- although Homer speaks of "the Pivot" most of his descriptions refer to the pivot as a motion. With a (near) stationary head, the body at impact somewhat resembles a letter "C" with the hips turned facing the target and most of body weight on the left side . If this is the "tilt" you are describing, the thrust is still downwards.