is one piece episode 508 filler?

After hearing the suggestion from Rayleigh, Luffy can not decide whether to follow it or not because of his promise to his friends to meet at the Sabaody Archipelago. Rayleigh says that he would give a second suggestion to Luffy.

Meanwhile on Weatheria, Nami tries to escape from the island, but fails to do so. She is then held captive by residents of the island thinking she is a traitor and a bad thief.

She becomes outraged and punches Haredas. She explains that she need to get off the island to meet her captain.