[Yoda]

But he really meant Homer had missed a Pressure Point - in the left/front foot?

There's no question that the golfer exerts pressure into the ground through the Feet. In fact, the Feet are the first link in the "gear train" of the Pivot (Feet, Knees, Hips and Shoulders) and its Lag (6-C-0). They initiate the Downstroke Sequence (6-M-1) and act to give the Stroke its maximum Radius ("Swinging from the feet" / 7-17). However . . .

The left foot's pressure against the ground does not actually drive the Lever Assembly (Left Arm and Club) during the Downstroke. Hence, it does not qualify as a Power Package Pressure. Instead, that work is accomplished by the Right Shoulder and its Thrust (6-B-4-A) against the #4 Pressure Point (where the Left Arm contacts the side of the chest / 6-C-1 #4). So . . .

While the Feet initiate the chain of events, it is the Shoulder that finishes the job. It is "the fastest and farthest moving component of the Pivot" (7-13) and the only Pivot Component that is also part of the Power Package (2H). It actually transmits the Pivot Motion to the Arms and, through the #4 Pressure Point, ultimately drives the Club.