is one piece episode 666 filler?

In the D block battle, after 20 contestants are knocked out, Gatz sees that someone is attempting to stand in the middle of the block, and that person is Rebecca. As it is announced that Rebecca is the block winner, the crowd begins booing her claiming that she must have cheated.

Meanwhile, at the prisoner gladiator quarters, Rebecca's friends cheer for her victory. Outside the Colosseum, Vice Admiral Bastille tells a marine about the Kamaitachi of Rommel.

He says that sometime ago in the kingdom of Rommel a strange wind was blowing during the night, that had the power to cut people up.