is one piece episode 907 filler?

The early beginnings of Luffy's pirate adventure are reiterated, set in a similar world, but with notable differences. For instance, this Luffy was inspired to become a pirate by his grandfather, who is a pirate himself rather than a marine.

Luffy is out at sea, when he encounters Ann and her pet, Balloon. They are both captured by Shupeal, a warlord equipped with psychic powers.

Imprisoned on Shupeal's ship, Ann explains to Luffy that the maniacal captain is after Balloon's magical blood and that she intends to save her friend. Luffy breaks both of them out of jail using his ability.