is bleach episode 152 filler?

As he runs through a corridor in Las Noches, 6th Division Lieutenant Renji Abarai notices someone's Reiatsu and assumes it belongs to Ichigo Kurosaki, only to be shocked when he instead discovers it to be Dondochakka Birstanne tearfully running and wailing behind him. When Renji demands to know what he is doing here and calls him crazy for coming down the corridor as well, Dondochakka declares he is looking for Nel Tu, only for Renji to question why Dondochakka is following him in this case and assume he is lost.