is one piece episode 51 filler?

As he walks through the streets, Sanji is challenged by Carmen, dubbed the greatest chef in the East Blue, who challenges him to the East Blue cooking contest. Sanji is initially uninterested, but later discovers the prize for winning would be a blue-finned elephant tuna, a rare fish native to the South Blue.

He decides to enter the contest. The contest, which is organized with a tournament bracket, begins, and Sanji and Carmen emerge as the two finalists.

At the end of the final round, before the winner is announced, Carmen acknowledges Sanji has defeated her.