is one piece episode 512 filler?

On an island in the Grand Line, Buggy's crew is crying and lamenting how much they have missed their captain. Buggy is also crying and lamenting that he had missed them so much and was stating how they had so much trust in him to wait for him.

Alvida commented to herself saying that those guys (Buggy's crew) had given up on him a long time ago. Then Mohji, Cabaji, and Richie introduced themselves to the new crew of prisoners that escaped with Buggy from Impel Down.