is one piece episode 519 filler?

Robin arrives at Grove 17 to find a fully coated Sunny as well as Franky who shows off his body modifications and informs her about the whereabouts of the other Straw Hat Pirates. Robin questions Franky about the flyer of Brook's concert to which he replies that Brook became a star and might have given up on piracy.

Brook is briefly shown still performing Bone To Be Wild at Sabao Dome. Meanwhile, Fake Zoro, Fake Sanji and the real Chopper arrive at Grove 47 and find the other members of the Fake Straw Hat Crew recovering from the blast of Haki they received from Luffy.