Yes he got it completely wrong
It all started with one simple misunderstanding..
And, it could be that he knew exactly what he was doing to the "Grace of God" as this is what the Devil hates.
So, SATAN gets his best ministers to twist "The Grace of God",,,,,Into something else.
And that is what JCalvin did., as John Calvinism is one of Satan's finest theologies.
Its right there with Islam.
He took the Grace of God, right out of The Cross by teaching that the Cross is "limited"..
So, that is a denial of John 3:16, and quite a few other verses, as well as an assault on the New Covenant and the Blood Atonement.
And where JC flew off the chain and right into the outer darkness of hyper error, is right here.
He REDEFINED..."God's Foreknowledge" as "God Predestined it all".
THAT is where this Religious nut bar began,...... regarding = twisting verses to FIT THAT
Calvin's core doctrine of devils is... "God knowing it all before it happens is God causing it all to happen".
See that?
That is ......to twist "God's foreknowledge" into "everything is already predestined... by God.".