is bleach episode 161 filler?

With 6th Division Lieutenant Renji Abarai staring in shock and questioning what just happened after his Bankai, Hihiō Zabimaru, is destroyed upon activation, Szayelaporro Granz resumes his explanation and informs Renji that he cannot perform Bankai in this room, which Renji repeats in disbelief. Mocking Renji for needing to say it again in order to memorize it, Szayelaporro elaborates that the shape, nature, Reiatsu, Reishi composition, and ultimate form of Hihiō Zabimaru are all familiar enough to him that he was able to make some adjustments to the area in order to seal it.