is bleach: thousand-year blood war (bleach: sennen kessen-hen) episode 39 filler?

In the laboratory within the returned Seireitei, Rin Tsubokura and Hiyosu type frantically on their terminals as 13th Division Captain Jūshirō Ukitake continues kneeling behind them with the shadowy tendril of Kamikake extending from his body into the sky, where it forms a tree-like shape and extends outward with its "branches" to cover the Seireitei with a multi-hued aura. Far above them, in Wahrwelt, Yhwach sits impassively on his throne.

Elsewhere in the castle, Sternritter "A" Uryū Ishida stands before the swirling Gate of the Sun and looks up at it.