is attack on titan (shingeki no kyojin) episode 72 filler?

Zeke Jaeger explains the circumstances of how he used his spinal fluid to transform the villagers of Ragako into Titans four years ago to Levi Ackermann. He says he did not want to do it, but it was necessary to prevent Marley from discovering his allegiance to Eldia.

Levi is still distrustful of him though, because Zeke does not appear to feel guilty about it. Changing the subject, Zeke asks when he and Eren will begin their test of the Rumbling, and Levi tells him it is up to headquarters.

A soldier then interrupts to provide news of Zachary's death.