is one piece episode 513 filler?

The episode begins with Trafalgar Law near Sabaody Archipelago. Meanwhile X Drake is on a winter island somewhere in the New World.

When he and his crew are attacked by some icicles, they start to run back. Suddenly, a massive iron dome opens up, revealing a hidden city and a huge cyborg shoots at them and states that he is a guardian, along with many others.

Drake asks the robot whether attacking him would get Kaido's attention; the robot informs him that it would. So Drake transforms into his Ancient Zoan form and prepares to fight it.