is one piece episode 879 filler?

At Marine Headquarters on New Marineford, Sakazuki asks about the statuses of the royals heading to the Levely. One Marine reports that pirates attacked the Lulusia Kingdom ship and kidnapped Princess Komane, angering Sakazuki.

The ships of Dressrosa and the Prodence Kingdom sail to Levely together, and Rebecca races up to Riku Doldo III with Leo, Kabu, and Bian, asking her grandfather if he read the article about Luffy.