Creating ignorance is not identical to being ignorant. A creature's state of not knowing does not imply ignorance in the one who brought that creature and its states into existence.
The attributes of a created object need not transfer to its creator. Creating fire, for example, does not imply bodily heat in the creator; similarly, a creature's ignorance does not imply divine ignorance.
The argument distinguishes the cause of a state from the subject in which the state inheres.