is one piece episode 621 filler?

Buffalo is surprised by how strong the Franky Shogun is. He then charges at Franky, saying that no one has ever been able to dodge the next attack.

Using his powers, he spins Baby 5 on one of his chains, who in turn uses Sickle Girl, and then slams her into Franky Shogun's left arm, impaling it. Franky laughs and says he will give them credit, but only for breaking through the robot's armor, and compares the pair to a praying mantis taking on a warship.

He then grabs Baby 5 and yanks on the chain, causing Buffalo to lose his balance and hurl forward.