Is ONE PIECE episode 971 filler?
Canon No, episode 971 of ONE PIECE is canon.
#971
Raid! Oden and the Akazaya Nine!
討ち入り！おでんと赤鞘九人男
Aired 25 Apr 2021
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.