is demon slayer: kimetsu no yaiba episode 33 filler?

The fierce battle between Akaza and Rengoku continues as Tanjiro and Inosuke watch from the sidelines. Though Rengoku is visibly being depleted as the battle progresses, Akaza has the ability to instantly regenerate any part of his body even after being slashed by Rengoku’s sword numerous times.

Rengoku resorts to the use of an Esoteric Art to put an end to the battle. He refuses to allow anyone to die in this struggle, however, the end draws near...