Interesting question, glcoach. I've never thought about it that way. But, I can see both the illusion and the reality.
The Clubhead has an Inclined Plane Line-of-Flight and passes Inside-Out -- Down Plane -- through Impact Point to Low Point. The Ball, on the other hand, in a dead straight shot has a Vertical Plane Line-of-Flight. So, assuming a Ball positioned prior to Low Point -- Up Plane -- the Clubhead passes outside the Line of Flight of the Ball. Hence, the dead straight shot could appear to be a Pull as the Clubhead passes outside the Vertical Plane.
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