is one piece episode 840 filler?

The Big Mom Pirates besiege Bege as his Big Father form continues to be trapped, and Smoothie wrings out the poison that Reiju attacked her with. Katakuri confronts Brûlée about her role in the enemy alliance, and she assures him in panic that she was a victim.

Meanwhile, Bege manifests inside his body and notes that this was the first time one of his assassination plots failed. He says that they do not have much time to think of a way out, and immediately afterwards, Big Mom stops screaming and regains her senses.