is bleach: thousand-year blood war (bleach: sennen kessen-hen) episode 20 filler?

In the Fourth Division's temporary first-aid station, Lieutenant Isane Kotetsu rushes to the side of 11th Division Lieutenant Yachiru Kusajishi, who has just been struck in the face, and asks her if her nose is bleeding because she bumped into something, only for Yachiru to admit that she does not know. Behind them, Guenael Lee confirms that this is how it is supposed to be and introduces himself to them as Sternritter "V", but Yachiru punches him in the face before he can explain his power.