is jujutsu kaisen episode 18 filler?

Megumi and Noritoshi Kamo confront their parallels — both burdened by clan expectations, both fighting to prove their own worth. Their battle is interrupted when Hanami, a special grade cursed spirit, invades the event.

The screen barrier traps the students with a threat that outclasses most of them individually. The Goodwill Event stops being a competition and becomes a survival situation.