is one piece episode 339 filler?

Nami notices that her Log Pose has not reacted to the presence of the island. Brook explains that is because Thriller Bark is an island that drifted from West Blue.

As he walks inside and picks up his cane, Brook tells the Straw Hat crew that this is a lucky day because he both met them and now sees one of his dearest wishes finally realized. He opens the door on the other side of the kitchen and jumps in the air on the prow.

Sanji remarks on how light he is. Brook then bids farewell to the crew.