The Calvinist position is not "free choice" but that the will is in bondage to sin. Any "choice" anyone makes is determined by outside influences, not by a "libertarian free will." Free moral agency is the Calvinist position, not "free will". There is no such thing as "free will". Martin Luther denied it in The Bondage of the Will and so did Calvin in Book 3, Chapter 23, Institutes of the Christian Religion.

For "who has known the mind of the LORD that he may instruct Him?" But we have the mind of Christ. (1 Corinthians 2:16 NKJ)