is one piece episode 281 filler?

Luffy announces that they are going to save Robin, as the drawbridge is lowered. Meanwhile, Nami thinks of how Robin's lonely days are now over, which reminds her of how she joined the Straw Hats herself.

In the flashback, Nami tells Luffy not to get involved with what is happening in her hometown and then goes to her house, where Nojiko observes the mess that Nami has caused in a fit of anger.