is bleach: thousand-year blood war (bleach: sennen kessen-hen) episode 23 filler?

Having seen a zombified 10th Division Captain Tōshirō Hitsugaya appear on a nearby rooftop, 11th Division 3rd Seat Ikkaku Madarame and 5th Seat Yumichika Ayasegawa express disbelief at this after having sensed the former's Reiatsu nearly vanish, and when Hitsugaya prepares to attack, Yumichika attempts to protect himself and Ikkaku with a Bakudō spell, only for Ikkaku to frantically warn him that this will not stop Hitsugaya and slam his Shikai, Hōzukimaru, into Yumichika, sending him flying back.