is one piece episode 228 filler?

Aokiji tries to crush the frozen Robin underfoot, but Luffy slides her out of the way to Usopp and Chopper. Luffy urges them to return her to the ship to thaw her, determined to fight the Admiral himself.

Once there, Chopper and Usopp run the shower over her to slowly thaw her, but Chopper is uncertain if he'll be able to resuscitate her once thawed. Nami arrives shortly after with Zoro and Sanji.

The latter two thaw their frozen limbs in the sea before returning to the battle to help Luffy, while Nami assists Chopper and Usopp in thawing and reviving Robin.