is one piece episode 160 filler?

Zoro, Nami and Robin continued exploring the forest when Robin brought to their attention that there is soil in their current location. They found it weird that soil is located on Sky Island which is supposed to be all cloud like.

Robin went on to comment that there is a great deal of investigation worth doing on the Sky Island. The 4 Priests awaited the rest of the Straw Hats while they chose which Ordeal they have to go through.

Luffy told them to go through the Ordeal of Balls and Usopp stated that the Ordeal of Balls feels less violent.