is jujutsu kaisen episode 6 filler?

In the aftermath of his death and revival, Yuji meets Sukuna face-to-face in his inner world. Meanwhile, Megumi and Nobara begin training for the upcoming Goodwill Event, each working to close the gap between themselves and the threats they've already faced.

Gojo keeps Yuji's survival secret from the other students, using the time to train him privately. The calm before the storm — the last stretch of normalcy before the world of jujutsu starts demanding payment for every moment of peace.