is one piece episode 706 filler?

Inside the Birdcage surrounding the ghost town on Minion Island, the Barrels Pirates are running while being attacked by crewmates controlled by Doflamingo's strings. A shocked platoon of Marines stand outside and report what is going on while trying to break through the Birdcage, to no avail.

Meanwhile, a boy named Dory has ended up outside the Birdcage, and three of his trapped crewmates beg him to help them. However, Dory runs away.

Meanwhile, two pirates are shot dead by the Donquixote Pirates, and Barrels hears it from inside his headquarters.