>the weapons slow down and only move forward when Yoru retracts from weaponizing Denji

Why does Death want to get rid of Denji?
That's what she wanted from the beginning of the manga, and she also wants Yoru to do it.
Is she lying about the prophecy again?
If hypothetically Yoru is a pawn and she kills Denji (the murders of the pawns count as Death kills), Death will have control of Chainsaw Man as Makima wanted.