is bleach episode 301 filler?

Donning his Hollow mask, Ichigo charges straight for Gin while keeping his Zanpakutō's ability in mind. Telling Ichigo whatever he is thinking, it is useless, Gin stretches his Zanpakutō straight towards Ichigo.

Blocking the attack, with a small part of his mask breaking in the process, Ichigo fires a Getsuga Tenshō at Gin. Unharmed by the attack, Gin, revealing he blocked his attack with his Zanpakutō, attacks Ichigo again, this time breaking the entirety of Ichigo's Hollow mask.