is demon slayer: kimetsu no yaiba episode 29 filler?

Tanjiro happily spends time with the family he once thought he lost. Yet this is only a dreamscape presented to him by Enmu (Lower One).

Enmu's goal is to infiltrate the unconscious realms of the sleeping Tanjiro and friends to destroy their spiritual cores. Can Tanjiro and his companions wake from their dreams before their spiritual cores are destroyed?