is jujutsu kaisen episode 5 filler?

Sukuna seizes control of Yuji's body and decides to test his new vessel by ripping out Yuji's heart. It's a power play — Sukuna wants to see if Yuji will beg, bargain, or break.

Yuji dies. Megumi faces the King of Curses alone, and the desperation of the moment pushes him toward summoning Mahoraga — a last resort that would kill them both.

Sukuna, intrigued by Megumi's potential, revives Yuji and returns control. The encounter plants a seed of interest in Sukuna that won't bear fruit until much later.