is demon slayer: kimetsu no yaiba episode 44 filler?

As the fierce battle draws to an end, Tanjiro and Uzui behead Gyutaro just as Zenitsu and Inosuke behead Daki. But then, Gyutaro unleashes a devastating Blood Demon Art, burying the city in rubble.

When Tanjiro awakens, he joins Nezuko and Zenitsu, only to find Inosuke and Uzui on the brink of death from Gyutaro’s poison...