is one piece episode 188 filler?

This episode is the continuation of the flashback from 400 years ago. The villagers are still enraged by the earthquake that they think was punishment for Noland killing Kashigami.

They gather around the cage in which Noland's crew is held prisoner and prepare to execute them to appease the Gods. However, Seto sits down in front of the cage to block the way - to the villagers' dismay - and tells them they should be ashamed of themselves.