is bleach episode 284 filler?

In a flashback, Emilou Apacci, as a Hollow, runs away from another Hollow, but it eventually catches up to her. Apacci fires off a Bala at the Hollows head, but it does no visible damage to him.

The Hollow tells Apacci that she has nowhere to run and that he's going to devour her. He tells her that she should pray for him to become an even greater Adjuchas.

However, before he can do anything Harribel arrives and goes to fight the Hollow. The Hollow mocks Harribel for her small size, but his head is immediately cut in half vertically by Harribel and dies.

Apacci wonders who Harribel is and speculates that she's a Vasto Lorde because of her huge Reiatsu.