is one piece episode 722 filler?

The island of Dressrosa begins trembling as the Birdcage begins closing in on itself, and the citizens watch in shock as the strings slice the buildings into pieces. They then run toward the downtown, struggling to outpace the cage.

Marines stationed on all corners of the island report that the cage is moving inwards. On the palace rooftop, Doflamingo reveals to an angered Luffy that the Birdcage is shrinking, which shocks the pirate as the Birdcage cuts up an aqueduct, flooding a large part of town.