Is ONE PIECE episode 302 filler?

#302

Robin Freed! Luffy vs. Lucci, Showdown Between Leaders!

ロビン解放！ルフィ対ルッチ頂上決戦

Aired 25 Mar 2007

Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.