is one piece episode 731 filler?

The citizens of Dressrosa are bewildered when their injuries are healed, but only care about getting away from the shrinking Birdcage. Suddenly, Hack and Usopp appear above them on a piece of rubble, and the citizens are shocked to see Usopp, wondering what he did to receive his five-star bounty.

Usopp says that his friends are pushing the Birdcage and tells any able-bodied citizen to go help them. The stunned citizens say that such a feat is impossible, but Usopp gets angry and tells them to go, and the citizens become scared of his perceived power and obey his orders.