Knowing a universal rule does not automatically entail knowing the application of that rule to every particular event. The universal fact and each contingent detail are distinguishable objects of knowledge.
For example, “All humans are mortal” is universal; “Zayd is in a particular city today” is particular. The first does not by itself inform a human knower of the second.
The affirmation of divine omniscience includes both. Human examples illustrate the distinction of propositions, not the mode of divine knowing.