Brian is using a slightly rotated plane line to get what seemed to be to be a tumbling draw.
Right you are, asleep. The Closed Plane Line -- not merely a Closed Stance -- causes the Clubhead to approach the Ball more from the 'inside' the Target Line. When you reduce the Downward (but not the Outward) element of the Three-Dimensional Downstroke, you automatically produce a shot with less spin.
However, care must be taken not to exaggerate the action, else the effort can quickly degenerate into a smothered Hook and a consequent loss in both Power and Accuracy.
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