is attack on titan (shingeki no kyojin) episode 54 filler?

Floch cries out when Erwin Smith falls from his horse, but Marlo Freudenberg urges him to continue the charge. Ahead of them, Zeke finds their efforts pitiful, and deems it a tragedy that King Reiss stole their memories of the world, since it is causing them to repeat mistakes of the past.

In his frustration, Zeke crushes the rocks in the Beast Titan's hand to dust, startling himself. He wonders what has gotten into him and reminds himself not to get worked up like his father as he prepares another set of rocks for bombardment.