is jujutsu kaisen episode 42 filler?

Yuji awakens to the destruction Sukuna caused with his body. The guilt is immediate and crushing — hundreds dead because Sukuna used him as a weapon.

Meanwhile, Nanami continues fighting through exhaustion, cutting down transfigured humans one after another. His stamina is failing.

His body is breaking. The most efficient fighter in jujutsu is running out of efficiency.