is one piece episode 370 filler?

Brook laughs proudly and seems well enough to fight against Oars and Moria. In the process of getting some salt, he had also drank down some milk to heal himself.

With the large quantity of salt, Sanji knows they only have one shot to purify Oars and beat Moria before sunrise. Moria then dares his enemies to try to get the shadows back.

Brook prepares to join in, but feels stiff. Usopp fires an Oil Star and massive Firebird Star to light Oars on fire.

Moria tells his giant minion to extinguish the fire as it feels nothing to him.