is one piece episode 956 filler?

Kawamatsu confirms to the Nine Red Scabbards that Hiyori was indeed alive. Then, Tama's grandfather, Tenguyama Hitetsu, gets back the sword that Luffy took from his house.

Then, he takes out the Enma, the sword promised by Hiyori, which is granted to Zoro. Zoro tries out his new sword on a tree, but the sword ends up drawing more Ryuo than necessary, creating an overly-powerful slash cutting off a piece of the cliff.

Hitetsu explains that the Enma is considered impossible to wield because it always uses excessive amounts of the wielder's Ryuo.