But is it POWER?

I was reading the quoted article below... is it really a power move?

Start of Article-

A split second before completing the back-swing, the best players make a slight lateral move with their hips and trunk toward the target. This move not only allows the arms to swing down on plane, it helps increase swing speed by providing improved leverage between the body and club. It’s a real power move. If you want to copy it, first train with my step drill to get the proper feeling.

On the range, grab a 7-iron, tee up a ball, and address it with a narrow stance. Your front foot should be in line with the ball. Take the club to the top, but before you start down, step toward the target with your front foot. This action will help you feel that lateral move the best players make. Hit balls this way to get a feel for this shift to your front side.

End of Article- Any Comments?

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Imagine winning nowadays using rusty old clubs!

This is Nick Bradley's "Step In Drill" it is a great drill to teach the transfer of weight from the right to the left side in the down swing. It does suggest that you start the move with your lead foot just prior to reaching the top, most top players do this to generate torque into the downswing and pull the arms, club and shoulders into an inside line.

I think the quote you have is a little out of context with the authors meaning.