This is correct. Parry has multiple effects. The most noticeable of which is that it can stun the opponent on a successful parry, but it also reduces the blocked damage that you receive when you successfully parry an attack.
Black Widow can reduce the ability accuracy of your attacks, making it possible to still have the damage reduction from a parry, but the stun may not happen. This is why you still see the Parry callout.
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Black Widow can reduce the ability accuracy of your attacks, making it possible to still have the damage reduction from a parry, but the stun may not happen. This is why you still see the Parry callout.