An omnipotent being could choose to remember how they created a universe, or not. They could decide whether to have any memory at all, if they choose a universe they know all about when creating it, then forgetting about it. Since they know for the necessary amount of time what it will do, they know they don't need to know anything else.
But if you introduce the question of whether the being wants to be able to change things, then it will need to have a memory, or it will need the knowledge of those things it wants to change, and when it will.
So it seems that giving an omnipotent being omniscient knowledge is the only way to resolve the paradox of change, or of changeable futures for this being. Therefore there is no change, or something.
It's a physics joke. What do you get when you give an omnipotent creator omniscience? A universe and change.