is one piece episode 812 filler?

Inside Sanji's guest room, he looks out the window and thinks about his rejection of his crew, and the army sent out by Big Mom to attack Luffy and Nami. Meanwhile, Luffy wakes up and finds that his arms are bound to a wall behind him.

Nami is next to him with the same binding, as the two are imprisoned in a page in a giant book. Several Big Mom Pirates stand outside, revealing that Luffy and Nami are trapped thanks to Mont-d'Or's ability.

Luffy tries to pull off his binding, but is unsuccessful, and the Big Mom Pirates just laugh as they close the book.