is one piece episode 878 filler?

As Shanks looks out toward the ocean with a newspaper in his hand, he remembers his time in East Blue 12 years ago. Wanting to be a pirate and join Shanks' crew despite his inability to swim, a 7-year-old Luffy tried proving his toughness by stabbing himself under his eye.

Afterwards, Luffy continued trying to convince Shanks to let him join as the Red Hair Pirates drank at the Partys Bar. A band of mountain bandits led by Higuma then came in and demanded alcohol, but Makino informed them that she was all out due to the pirates drinking everything.