is attack on titan (shingeki no kyojin) episode 83 filler?

A half day before, Hange Zoë discreetly kills a Jaegerist when he comes to look for his friend, in order to keep their hiding place with Levi Ackermann safe. Hange assures a motionless Levi that those were the last of their pursuers.

As Hange sutures his face they speculate that the only reason he is not already dead from his wounds and escaped his unit being transformed into Titans is because he is an Ackermann. Disheartened and unaware of changing circumstances, Hange sits and mulls over all their problems since the Jaegerists took over.