is one piece episode 975 filler?

News of Oden's death spread to Toki, who reflected on her final moments with Oden. Before he left to confront Kaidou, Oden entrusted Toki with a scroll to be opened if he died in the battle.

The scroll prophecized that in twenty years, someone would arrive to save Wano Country. Pursued by Beasts Pirates, the Nine Red Scabbards ran through the forest to escape back to Oden's castle.

Ashura and Denjiro were forced to stay behind to battle the Beasts Pirates. Kaidou's men fired flaming arrows at Oden's castle, setting it ablaze with Toki, Momonosuke and Hiyori still inside.