is one piece episode 780 filler?

After Luffy wasted all their food supplies, the Sanji Retrieval Team is quickly left starving, with Luffy famished to the point of even trying to eat Chopper. Pedro then sees an island from afar, and Nami realizes that it must be the island she spotted on the map in Zou.

The team prepares to look for food there, but Pekoms reveals that the island, Fron Island, is home to a Marine base that keeps an eye on Big Mom and is full of hotshots. The team heads for the island's shore in the Shark Submerge III, with Pedro and Pekoms staying behind to guard the Thousand Sunny.