is jujutsu kaisen episode 43 filler?

Yuji and Mahito clash directly. Mahito uses transfigured humans as shields, exploiting Yuji's refusal to abandon civilians.

Separately, Nobara encounters one of Mahito's clone bodies — a Polymorphic Soul Isomer. The fight goes wrong.

Mahito's Idle Transfiguration hits Nobara in the face. She falls.

Her fate is left ambiguous, and Yuji witnesses another person he cares about being destroyed by the enemy he hates most.