is one piece episode 259 filler?

Kalifa and the rest of CP9 has just been informed by a government agent that the rear two cars have been detached. Kalifa asks how could they let that happen but the agent tries to defend himself saying even T Bone has been beaten.

Kalifa wants a status report and the government agent says that there are still five cars left but the Marines and World Government agents have been taken out in the fifth car. He says that Wanze is guarding the fourth car, Nero in the third car, Nico Robin in the first car, and everyone else in the second car.