is one piece episode 425 filler?

Luffy is seen diving while Buggy quickly follows behind saying he doesn't want to descend to a further Hell. Buggy's body lands on the ground first followed by his head and Buggy looks around remaking how "creepy" it is.

Buggy then says that he has the scope to find Captain John's treasure but before the greedy pirate can make a move, Luffy grabs his head and suddenly starts to run off wanting to know where to go next. They continue running until they reach a dead end and Luffy looks around in the area.