is one piece episode 769 filler?

Nekomamushi apologizes to Raizo for lying to him and trapping him here for his protection, and Raizo then sees Kin'emon, Kanjuro, and Momonosuke coming down the stairs. The four Wano Country natives happily reunite, and Raizo is released from his chains by his comrades.

Robin, Nami, and Brook then reach the bottom of the stairs, and they look in awe at the Kouzuki Family crest on the wall and the giant red poneglyph in the center. Robin asks Inuarashi and Nekomamushi for permission to read it, which they grant her.