[Yoda]

So the delivery line is still intended to smash the ball into the ground with the cross-line approach.

Yes. The Player uses the Delivery Line -- the Baseline of the Inclined Plane -- to guide (deliver) the Clubhead through Impact. This Baseline is termed the true Geometric Plane Line (2-J-3) and is designated The Guide Line (10-5). [Advanced TGM Note: The Hitter using the Angle of Approach procedure would have a different Delivery Line and, therefore, a different Guide Line.]

The Player uses his Right Forearm and #3 Pressure Point to Trace this Straight Line Baseline during the Downstroke, thereby producing the proper Three-Dimensional Impact -- Downwarad, Outward and Forward.