is one piece episode 417 filler?

As Luffy and Nyon arrive to ask her, one of her subjects arrives and reveals that Hancock has contracted a fatal illness. Hancock has caught an unknown disease and feels in great pain for some reason.

As Nyon deduces her illness, she says she knows the illness and when Hancock asks if she will die, Nyon says she will, much to Sandersonia's and Marigold's anger telling her not to joke and she says she isn't.