is one piece episode 183 filler?

The episode starts as Nami rehashes what she realized at the end of the previous episode: that because rubber does not conduct electricity, Luffy is immune to Enel's lightning attacks. Enel wakes up and jumps away from Luffy.

He does not understand what Luffy is and Luffy tells him that he is a pirate and a rubberman which puzzles Enel even more as the White-White Sea does not have rubber. Luffy attacks Enel again but due to his mantra, Enel dodges every shot and starts to fight back with his golden staff and pins Luffy against a wall.