is demon slayer: kimetsu no yaiba episode 42 filler?

Hinatsuru’s use of wisteria poison leaves Gyutaro momentarily vulnerable, but Tanjiro and Uzui’s attacks fall just short. Using his Blood Demon Art, Gyutaro vanishes from Uzui’s sight only to reappear assaulting Hinatsuru.

Tanjiro and Uzui attempt to save her, but they are thwarted by Daki’s Belt.