is one piece episode 506 filler?

The episode starts off with Zoro on Kuraigana Island, with Perona accompanying him. He is seen fighting against humandrills.

He manages to keep equal grounds with them, but is then thrown against the giant cross. The humandrills are about to attack, but then are mysteriously frightened.

A mysterious figure approaches them and the baboons run off in fright. The figure is actually Hawk-Eyes Mihawk.

Zoro looks shocked to see him. The scene changes to Torino Kingdom, where Chopper is hanging over a hot pot, about to be eaten.