God is never said to be reconciled. It is man that must be reconciled. It is definitely related to the N.T. mercy seat and propitiation. While it is helpful to consult word studies on atonement, reconciliation, etc. A. God Saves Only Sinners .
Man is a sinner by birth, nature and practice.
Sin is transgression of the Law. By God's Grace . Grace is God's unmerited favor. No man merits it. It is wholly of grace.