is one piece episode 756 filler?

Kin'emon, Kanjuro, and Bariete sit on a deformed Nekozaemon after being deluged by Zou's Eruption Rain; they then notice in shock that they have fallen back to the Thousand Sunny. They are intent on continuing, but realize that Nekozaemon is severely deformed and dripping ink, which frightens them.

They push Nekozaemon upward, but the severely weakened cat drawing quickly slides back down after taking a few steps, nearly falling into the ocean.