is one piece episode 647 filler?

Don Chinjao is impressed by Luffy's Supreme King Haki. Luffy tells Chinjao that he aims to be the Pirate King and Chinjao scolds him, saying that there are many people in the sea with the right qualities to become king and he must conquer all the conquerors for that to happen.

Chinjao asks Luffy who taught him haki and Luffy says it was Rayleigh. Chinjao is surprised that Rayleigh is still alive and hits Luffy, telling him that he doesn't want to remember the past.

Don Chinjao starts crying that his treasure was in front of him but he couldn't reach it.