Pitch and punch loading refers to the position of the trail elbow in the BS and transition. Pitch loading would have the elbow pointed more down and in front of the trail hip in the BS and then seek the trail hip in the transition. Punch loading would have the tail elbow move laterally in the BS and be more behind o along side the hip so the trail arm can leverage against the trail shoulder for a true hitter's motion (ala Kenny Perry).
Even a true Hitter will lead with the left arm but will overcome the centrifugal force of the rotary swing with the use of the trial arm and shoulder leverage. A pure swinger will use the pivot to drive the swing, have more or less passive arms (at least until very near impact) and ALLOW the release to occur rather than forcing it as a Hitter would do (pushing). Both have different mechanics for the BS, hip rotation, and particularly the hinging of the wrists. A swinger will use horizontal hinging to release the leverage, and a hitter will use angled hinging. Not good to mix the one with the other. So if you are Bertholy student I hope you are more a swinger than a hitter because his mechanics fit more the swingers positions and a horizontal hinge release. Homer Kelly laid out most of this in TGM and a number of insructors have clarified it nicely with their instruction on their forums.