is bleach: thousand-year blood war (bleach: sennen kessen-hen) episode 8 filler?

As rain falls across the rubble of the Seireitei, 4th Division 3rd Seat Yasochika Iemura orders units 11 through 16 to the west 56th district and the rest to accompany him while prioritizing the injured and leaving the dead Shinigami for later. In the crowded Fourth Division barracks' Sōgō Kyūgo Tsumesho, 7th Seat Hanatarō Yamada has a critical patient on a stretcher taken to room 203 as Lieutenant Isane Kotetsu watches the commotion from above and turns to her captain, Retsu Unohana.