is one piece episode 86 filler?

Luffy is locked down in a room by Chopper, but he steals the key and is able to get out. After Luffy starts chasing Chopper again, he suddenly stops because he smells Wapol is nearby.

Kureha continues telling the story of Chopper's past. Chopper is running through the woods when he suddenly crashes into a tree, he then remembers about when he heard Wapol's soldiers talking about a mushroom that could cure all diseases, requested by the Isshi-20.

He proceeds to enter Hiriluk's place in search for the book where the mushroom is depicted.