is bleach episode 89 filler?

Having been confronted by 12th Division Lieutenant Nemu Kurotsuchi near a river springing from a waterfall in the forested outskirts of Karakura Town, a surprised Uryū Ishida recognizes her, and as Nemu identifies herself, Uryū recalls their prior meeting in Soul Society where Nemu gave him the antidote to the poison produced by the Bankai of her captain, Mayuri Kurotsuchi. With Nemu noting that it has been a while, Uryū questions why she is here, only to find Nemu suddenly leaping toward him.