is bleach episode 338 filler?

Kon tries to shake Yushima awake, but Kisuke Urahara tells him that it’s useless. Kon laments that without Yushima, they would not be able to get the location of Kagerōza’s laboratory.

Urahara says that he actually expected this, saying that Yushima probably realized he’d be imprisoned to conceal the existence of Project Spearhead, so he must have hidden it. He kneels down, saying that he has found the clue to their problem: Kagerōza’s blood.

Kon asks how blood is going to help and while Urahara and he uses a device on the blood to determine the location, Urahara explains that Captain Mayuri Kurotsuchi had injected a drug inside Kagerōza and that they will use the drug to find him.