is one piece episode 856 filler?

With Luffy buried under the massive pile of mochi, Katakuri calls out to his chefs to bring in the sweets for his merienda. The chefs come out and proudly display the large donuts they made from rare ingredients, although the tea had become cold while Katakuri had been fighting.

However, Katakuri accepts iced tea, relieving them. Katakuri then constructs a house out of mochi to eat his snacks in private, and the chefs are impressed at what they think is Katakuri trying to take the time to concentrate.