is one piece episode 819 filler?

On Whole Cake Island, inside the Chateau infirmary, a doctor and a homie guard both comment on Reiju's incredible enhanced healing ability. As they talk, Sanji sneaks in undetected and ties and blindfolds the homie to a chair.

Reiju then wakes, noticing Sanji's presence with surprise. She also inspects her injured leg while recalling foggily that she had been caught in a supposed crossfire.

Sanji tells her that her memory has been overwritten, and proceeds to tell her what really happened. In the Prisoner's Library, Jinbe burns the book imprisoning Luffy and Nami, in order to free them.