is one piece episode 186 filler?

The episode starts with Enel shrugging off Sanji then hearing the explosion and seeing the black clouds are not coming out of the chimney anymore. Enel curses Sanji and figures one of the gears must have been dislodged.

He dematerializes to go reset it. Sanji's blackened and seemingly lifeless body is still on the deck.

We see Usopp has hooked the Usopp AAaaaAAAaaaAA on a sidewall of the ship and is climbing up the side thanks to his starfish-shoes. He peeks on the deck and sees Enel is gone.

Usopp talks to Sanji's body and reassures him that Nami landed safely.