is bleach: thousand-year blood war (bleach: sennen kessen-hen) episode 5 filler?

With Tsūdentō being thrown into the ground and walls near the captains, lieutenants, and seated officers of the Gotei 13 across the Seireitei, Rin Tsubokura speaks to them from within the Shinigami Research and Development Institute and reveals that Ichigo Kurosaki is on his way to Soul Society with his Bankai unable to be stolen by the Quincy, shocking and elating those listening, though 12th Division Captain Mayuri Kurotsuchi is merely annoyed by his 3rd Seat, Akon, acting without permission.