It means exactly that.
God's omnipotence demands that he ordained and willed the fall.
Omnipotence says that God is ALL powerful. That means that ALL power is his. There is no power that exists that is not his.
The power a rose utilizes to open against the morning sun is God's power. God opens the rose.
The power to lift the plump bumble bee off the earth by tiny wings is God's power. God flies the bumble bee.
The power to contract the human arm is God's power. God contracts the human arm.
The power to chew and consume and digest food is God's power. God is masticating the food for the human. It is his power that tightens the jaw muscles, his power that breaks down the food, his power that enables peristalsis carrying the food to the belly, etc...
When Adam contracted the arm that brought the forbidden fruit to his own mouth- God contracted that arm. God powered the biceps that brought the forbidden fruit to the mouth of Adam.
When Adam bit into that fruit God flexed the jaw muscles.
Omnipotence demands that God is the ultimate cause behind everything.
Scripture says, In him we live and MOVE and have our being.
Scripture says, "He is before all things and by HIM ALL THINGS consist."
Scripture says, "For OF him and THROUGH him and TO him are ALL THINGS."
There is nothing that takes place that is not OF him.
No action that is not powered BY him.
There is no event that does not exist THROUGH him.
NONE.
God is all powerful and in COMPLETE control not just OVER all things but OF all things and IN all things.
That is the one true God.
Then we have no need of a savior. God is the reason we all do evil. Man is innocent.