is one piece episode 8 filler?

Buggy reveals his relationship with Shanks, as they were both apprentices working for a pirate crew. While the pirates were looting a ship, Buggy found a valuable treasure map and kept it for himself.

He later learns from Shanks that the pirates have also looted a Devil Fruit from the ship. Buggy planned to steal the fruit, escape the crew and sell both the fruit and the map.

Buggy ate a fake Devil Fruit in front of the pirates while he kept the real one for himself. However, just before he was able to leave with the fruit, he was caught by Shanks, causing him to accidentally eat the fruit.