is one piece episode 580 filler?

Luffy, Zoro, Robin, and Usopp are now facing the dragon who asks who they are. Luffy exclaims that the dragon just talked, but Usopp says that he is hearing things, while running away.

As they remain intrigued about the dragon, it lets loose a burst of fire, which they all narrowly evade. Usopp trembles in fear while Luffy and Zoro get excited about facing the dragon.

Luffy uses Jet Pistol, which does not seem to effect the dragon much, and he realizes that its hide is really hard. The dragon slams Luffy down with its tail forcefully.