is one piece episode 884 filler?

The group of royals including the Neptune Family and Sterry reach the top of the Red Line on a bondola and disembark to a large staircase leading up to Mary Geoise. They are greeted by a guard, who is actually Sabo in disguise.

The Neptune Family is given new bubbles suited for the elevated climate, and after traversing the stairs, the royals gaze at the pristine landscape of Mary Geoise. They are still a ways off from Pangaea Castle, but the guards take them to moving walkways known as travelators.