is one piece episode 758 filler?

Wanda turns around in confusion after hearing Luffy mention a ninja. Usopp, Nami, and Brook immediately start beating Luffy up, and try telling Wanda that they are doing so to show him minkship.

However, Wanda knows she heard something about a ninja, and Brook claims on the spot that Luffy was wondering about how the kanja (patient) was doing. Wanda is relieved that the Straw Hats care so much about Inuarashi, and the group draws closer to the Duke's sanatorium.

At the sanatorium entrance, a lion mink named Shishilian is throwing other minks into a pit for mentioning sweet things around him.