I don't get it...is the clubhead following the "clubhead orbit" in the diagram or is following the angle of attack?
The Clubhead is following the Clubhead Orbit. The Angle of Attack is that straight line drawn on the face of the Inclined Plane (and viewed from above it) that connects the Impact Point and Low Point. This is Impact's Downward Dimension.
That same line viewed upon the ground is the Angle of Approach (Impact's Forward Dimension).
Impact's Outward Dimension is determined by the Angle of the Inclined Plane.