is jujutsu kaisen episode 37 filler?

Yuji reaches the underground and runs directly into Choso. The eldest Death Painting Womb launches Supernova — blood projectiles from every direction — and engages Yuji in a brutal fight.

Choso's Blood Manipulation arsenal (Convergence, Piercing Blood, Blood Edge) overwhelms Yuji in the confined space. The fight is a showcase for Choso's complete mastery of blood techniques.