That was what I was thinking as I typed it. I should have put a smile on it
But in this case it really does depend on how we define all. Is all everything except mans free will?
My fave professor said "all-powerful" could be construed "All the power that is, is God's". Then such power as anything else might have, if any, would have been delegated or handed over. Our Calvinist brethren seem to be doing an pretty exhaustive job of looking at that.
Similarly with "all-knowing". And this leaves the questions about the future and making a rock so big He can't life it to other parts of the conversation.