The support website seems to have mixed up the interaction of parry and ability accuracy reduction.
It says that in the presence of Ability Accuracy reduction that a stun will always apply but the damage will not be mitigated. My in game experience is the opposite of this.

This has left me questioning reality itself...this can’t be true can it?
*This is found under the Battle Status Effects section; which used to be home to a handy list of icons and their descriptions, miss you icons.