is attack on titan (shingeki no kyojin) episode 47 filler?

In Capital Mitras, the Military Police Regiment begins construction on an outdoor platform for Historia Reiss's coronation ceremony. Meanwhile, Levi Ackermann searches the ruins of the Underground Chapel.

He finds the remains of the Anti-Personnel Control Squad, crushed by falling debris. A Scout runs up to him and announces that they have found Kenny Ackermann.

Some years ago, a much younger Kenny Ackermann encountered someone stronger than him for the first time.