is one piece episode 466 filler?

Luffy along the Impel Down escapees are falling from the sky, and a flashback starts. It shows how they were pushed by Whitebeard's seaquake which then turned into a tsunami, which quickly scares Buggy and the other pirates.

Crocodile is fast in putting them in order by claiming that they can use the tsunami to their advantage and ride the wave. It is then frozen by Aokiji and they can see the battle has begun.