is one piece episode 820 filler?

After he is cut in half, a giant yolk flies out of Baron Tamago's body. To his surprise, the seemingly victorious Pedro watches as the yolk reforms into a different version of Tamago, who is covered in yellow, possesses a chicken beak and wings, and wields two daggers.

The Big Mom Pirates around them cheer on as Tamago's new form, Viscount Hiyoko, attacks Pedro while making clucking noises. Hiyoko is an improved swordfighter, and he barrages Pedro with rapid attacks that the jaguar mink has trouble keeping up with them.