is one piece episode 911 filler?

Kin'emon continues telling the story of the past. Now that Kaidou had taken over Wano Country, he decided to recruit allies to fight for them.

Raizo, Kanjuro and Momonosuke escaped the country to Zou in search of more allies. However, one by one they accidentally got separated in Zou, Dressrosa, and Punk Hazard.

Kin'emon explains that to take down Kaidou and Orochi, the Ninja-Pirate-Mink-Samurai Alliance will carry out a raid on Onigashima during the country's Fire Festival. The Straw Hats who arrived at Wano Country earlier have previously been assigned a task to prepare for the raid.