is attack on titan (shingeki no kyojin) episode 57 filler?

Grisha and Fay Jaeger find themselves in a larger part of the city beyond the security gate of their neighborhood. They bump into a man who curses them as "devil-bloods" and comments on Eldians going where they please.

Fay is uneasy, but Grisha distracts her by showing her the way to where the airship would land. They climb a short set of steps to see a river stretched out before them with a hangar on the other side.

As Fay admires the airship, one of two men from Marley Public Security ask if the kids have come to see the airship and whether they have their exit permits.