is jujutsu kaisen episode 15 filler?

The Goodwill Event begins. Tokyo's plan to use Yuji as a distraction against Todo backfires when the entire Kyoto team targets Yuji instead.

Todo ignores his assassination orders and challenges Yuji one-on-one, not to kill him but to test him. The fight becomes an impromptu training session as Todo, inexplicably declaring Yuji his best friend, begins teaching him how to channel cursed energy properly.