is one piece episode 340 filler?

Usopp, Nami, and Chopper take up Hildon's offer in accompanying them to the mansion while they traverse through the forest via carriage. Inside the carriage, they discuss the strange creatures in the forest with Hildon telling the three that it is dangerous at night and that the mansion is the best place to wait for the rest of the crew.

Chopper excitedly asks if they can really meet Dr. Hogback, a doctor whom he idolizes, and explains to Usopp and Nami who he is, telling them that he is a renowned surgical genius who suddenly disappeared without a trace.