is one piece episode 421 filler?

On Momonga's ship, Hancock continues to worry about Luffy leaving her for Nami and Robin, while Luffy loudly burps and comments on how delicious his food is. Hancock warns him that he is being too loud, and Lieutenant Stalker overhears Luffy and becomes suspicious of Hancock.

On a gloomy island, Perona complains to herself that, although Kuma took her where she asked when he sent her flying, she is bored and annoyed by the lack of any servants or stuffed animals. She sees Zoro land and takes him to the island's castle.