is one piece episode 703 filler?

Law stands frozen as he tries to comprehend the fact that Corazon can talk. Corazon says that he was always able to talk, and Law asks him why he kept it a secret from Doflamingo.

Corazon replies that he never told Doflamingo he was a mute, although Law shouts that that is the same as trickery. Law's shouting causes some of the citizens to notice him and Corazon in the alley, so Corazon creates a circular barrier around them.

Law realizes in shock that he can no longer hear anyone around them, and Corazon says that he put up a soundproof wall, and no one can hear them now either.