is one piece episode 726 filler?

As the citizens of Dressrosa continue running from the shrinking Birdcage, Marines and pirates alike assist the handicapped. Some citizens notice with a shock that the buildings not being sliced up by the Birdcage are being pushed along with it, making them even more afraid.

On the second level of the palace plateau, Baby 5 explains how shrinking the Birdcage was Doflamingo's way of preventing his evil actions from being told.