is demon slayer: kimetsu no yaiba episode 24 filler?

The injured Tanjiro, Zenitsu, and Inosuke are sent to the Insect Hashira Shinobu Kocho’s mansion for treatment. When Tanjiro and Inosuke start their rehabilitation training two weeks later, the drills are so brutal that they find themselves broken in spirit.

Meanwhile, Zenitsu, unaware of the grueling regimen, becomes very enthusiastic to finally join the training when he sees all the girls, but...