is one piece episode 605 filler?

Watching the broadcast of his experiment, Caesar Clown comments that there is now no place left on Punk Hazard where anything can survive. However, he notices the lack of the G-5 Marines in front of the building and notices that he cannot see the Straw Hats, Smoker, and Law in the cage.

Monet, also watching, asks Vergo's opinion, and he says that since they cannot see anyone in the cage, they must have escaped. He adds that he may have to kill Law himself because he is troublesome to let wander around.