is one piece episode 420 filler?

On Momonga's ship, Hancock fetches Luffy some food while two of the Marines comment on their many crew mates who've been turned to stone, wondering if they'll actually make it to Impel Down. Hancock asks Luffy about his crew and panics when she hears about Nami and Robin, imagining Luffy leaving her for them.

Elsewhere, Soran finds Robin in the snow and invites her into her home, avoiding officers who are whipping fellow people of the country on the way.