is attack on titan (shingeki no kyojin) episode 62 filler?

Karina Braun sat next to young Reiner Braun, explaining to him why his father was not around. Reiner's father was a Marleyan, and since relations between Eldians and Marleyans were strictly forbidden, he could not be with them.

Karina tearfully wished they were Marleyan. Back in the present, Reiner lies in his old room and recalls how he strove to become a Warrior so that he and his mother could be Marleyans.