is one piece episode 255 filler?

Luffy wants to depart right away to Enies Lobby even though the Aqua Laguna is hitting the island. He asks Paulie if there's a ship he could borrow to get them there, or better yet, a sea train.

Paulie informs them that the sea train was built by a team headed by a legendary shipwright and there's nothing else like it in existence in the world and if they were to set out, they would immediately get killed so they would do better to wait until morning.