is one piece episode 171 filler?

Usopp cries over the loss of Sanji, but Nami states that he was checking if his heart was beating on the right and he needed to check the left side. On doing that, Usopp became relieved that Sanji's heart was still beating.

At that point, Usopp threatens Enel by lying that he has 8,000 followers and will spare Enel's life if he leaves. Enel, upset at Usopp, takes him out with his Goro Goro no Mi.

Enel then told Gan Fall that the Divine Squad members, who he seized six years ago, have been working long and hard till this day without rest.