is one piece episode 871 filler?

Right as Luffy and Katakuri hit each other with their final blows, Brûlée manages to free herself from her rope bindings. To keep Luffy from escaping the Mirro-World, she decides to run off and join Oven's group on Cacao Island.

At 12:28 AM, Oven's army waits for activity to happen, and Newshi ponders the possibility of Luffy beating Katakuri. Oven and several other siblings admonish him, refusing to believe Katakuri could be beaten.

However, they do think that Luffy could capture Brûlée and run away from Katakuri when his crew arrives at 1 AM, and so are waiting to ambush him.