>>713907454
It's more like, an armored move with a follow-up (manual input).
If you look at it as a purely defensive tool, then it's one of the weakest, together with Lowains parry. There are more answers to this move than to your usual parry in this game, and it requires a reaction/knowledge check from the Zeta. And don't forget the nerf it received as well (no other parry was nerfed this way).
Together with her surprisingly sluggish M-buttons, she does indeed have pretty weak defenses.