is one piece episode 865 filler?

Mirrors are shown breaking on Wheat Island and citizens are getting scared that if the battle continues longer, there will be no mirrors left on the island, before switching to the battle itself. Katakuri continues to overwhelm Luffy, but Luffy is not giving up.

Back on Whole Cake Island, Mont d'Or and Niwatori are shown talking about how long the fight has been going on, showing the time as 9:30 pm, which is six and a half hours since the start of the fight. Stussy and Morgans come into view, with Morgans saying how it would be big news if the Straw Hats got away.