is one piece episode 720 filler?

Hanging off a ledge, Zoro recalls his training with Mihawk, in which the master swordsman informed him that having chips on the blades of his sword is an affront to his honor and that he could prevent this by hardening his blades with Armament Haki. He also forbade Zoro from drinking until he mastered the technique.

At the King's Plateau, Fujitora asks his men if there are any wounded, but is informed that his Devil Fruit powers kept them all safe as citizens and combatants around the country react to Pica's defeat. Meanwhile, the SMILE Factory explodes, to the shock of those who can see it.