is one piece episode 527 filler?

The Straw Hats encounter the mysterious fish-men riding one of the sea-beasts. One of the fish-men, Hammond, insults Surume for carrying the crew or "those sinful humans." Surume gets scared and leaves the Thousand Sunny and its crew behind.

After Surume left, Hammond addresses the crew and their achievements (namely beating Arlong, defending Hachi, and punching a World Noble). He then offers the crew a choice: either join the New Fish-Man Pirates or die.

Luffy immediately responds by saying no and making a face at Hammond.