is bleach episode 291 filler?

The release of Shinji's Shikai, Sakanade, prompts Aizen to comment that it is an interesting shape for a katana. Shinji responds that it is great and he will not lend it to him.

Aizen then states that he finds it strange that it does not give off any particular kind of aura. So he questions if he has heard wrong about it being able to control the five senses.

Shinji tells him to take another look as it is already changing and he casually asks if it has a nice scent. He then tells Aizen it is too late and welcomes him to the inverted world.

Much to Aizen's surprise, he now appears as though he is standing upside down in mid air.