is one piece episode 844 filler?

Big Mom continues her crazed rampage destroying Sweet City. To her crew's horror, she throws Opera's lifeless body into the ground, having removed some of his lifespan.

Smoothie decides that they must find a wedding cake to give to Big Mom to stop the rampage. However, head chef Streusen had gotten critically hurt from the fall and was unconscious.

Perospero gets an idea. He lies to Big Mom, telling her that the Straw Hats have an extra wedding cake.

This works, and Big Mom leaves Sweet City to pursue the Straw Hats, buying the family some time.