Yes. Autocorrect is a bitch.
I don’t think you’re understanding.
First of all, there isn’t a projectile going towards Unohana when Law swings his blade. It’s as if it’s on her, so whether she moves to the left or not, the cut is just on her.
Secondly, how would she know to move? In her eyes Law is just swinging his blade from 4km away. She doesn’t have knowledge on his abilities AFAIK, so I think that saying that she’d know to dodge is extremely generous.
Third, because of his Kenbun, Law would be able to know what she’s planning on doing before she does it. Because of that, he can just use Takt to hold her in place, then cut her up that way.