is one piece episode 826 filler?

In the Mirro-World, Chopper finds a shard of a mirror that had been broken previously. With this shard, he is able to communicate with Luffy, who found the other shard near Kingbaum's body.

They update each other on the situation, and plan to crash the upcoming tea party and wedding. At Big Mom's castle, Charlotte Daifuku, another officer of the Big Mom Pirates, appears at the gate.

Chess soldiers offer to open the door, but Daifuku uses his Devil Fruit ability to summon a genie to pry the gate open. Meanwhile, back in the Mirro-World, Jinbe tells more about Capone Bege's past.