is bleach episode 255 filler?

Falling through a red-black vortex, Ichigo crashes into water and emerges within Kōga Kuchiki's inner world. As Ichigo wonders where he is, Muramasa steps forward.

As Ichigo turns around in surprise, Muramasa states he is surprised to see Ichigo. When Muramasa asks him how he got here, Ichigo says he does not know and asks Muramasa where they are.

Asking Ichigo if he cannot tell, Muramasa states he had a place to call his own just like how Zangetsu has a home in the world of Ichigo's mind. Looking around, Ichigo realizes where he is and says Kōga is dead.