In the section in which I found the sentence you quoted, it is in fact the only statement he makes in the near proximity on the topic of Adam's repentance or lack thereof. I'm assuming there is more, since you mentioned his thorough basis; I would like to read it, if you would point me to where in the article I might find it. A phrase to do a search for would be great. Thanks!
Pink's argument is a whole piece; primarily having to do with the ordained federal headships of the two Adams under the two covenants; which in my opinion is deserving of an entire read for anyone truly interested in the truth of the matter.
I fail to see what bearing Adam's federal headship under the covenant of works could possibly have upon forgiveness he could have subsequently received in the Covenant of Grace.
The doctrine of federal headship teaches us that Adam is head of the entire human race, and the last “Adam” Jesus Christ is head of His elect church.
When Jesus Christ was crucified and died, due to His representation of all those given to Him by the Father, these are said to have also died to sin. When Christ resurrected from the grave, it is taught that His people were also raised to new life:
“Therefore we were buried with Him through baptism into death, that just as Christ was raised from the dead by the glory of the Father, even so we also should walk in newness of life. For if we have been united together in the likeness of His death, certainly we also shall be in the likeness of His resurrection . . . Now if we died with Christ, we believe that we shall also live with Him.” Romans 6:4,5,8
Just as Adam’s disobedience and sin under the covenant of works was the legal basis for God to impute sin to all of Adam’s descendants, so was the last Adam’s righteousness the basis for the elect to be imputed with righteousness and made fit to be reconciled with God according to the Covenant of Grace.
When Adam failed, we all failed, for Adam was our earthly federal head.
When Jesus Christ achieved victory over sin, death, and the devil, all Christians are assured His victory is theirs’, because He is their spiritual federal head.
So consider this: If Adam had repented and exhibited faith in the promise God made to Satan and Eve (Genesis 3:15), and had received pardon of his sin and given grace by God unto salvation, then the entire human race would have benefited from that grace, since Adam represented us all. Every human represented in Adam would have been made recipients of God’s forgiving grace, according to the doctrine of representation under Federal Headship. If Adam was brought under the Covenant of Grace in the garden, then all his descendents would be born under that Covenant of Grace, because Adam is federal head of all mankind.
This would be the necessary evidence that Adam indeed repented of his sins before God, and placed his faith in the promised Savior.
But that is not reality or the teaching of Holy Scripture, is it?
All men, born in the flesh from Adam, are born sinners, still obligated before God under the Covenant of Works, and remain under the condemnation of that Law and consignment to death . . .unless and until they receive the benefits of the new Covenant of Grace by faith in Jesus Christ.
So the point is, how can the federal head of all sinful men, be rescued by faith in the promised Savior, but his unborn descendants come into the world totally depraved and corrupted under the Covenant of Works and in need of a Savior?
If righteousness and pardon was Adam’s, while still living as federal head of the human race, then God’s grace and saving pardon should be universally expected by all men.
(And then there goes the Scriptural doctrines of Unconditional Election and Limited Atonement!)
“Direful and dreadful as was the outcome of the Adamic covenant, yet we may, with awe, perceive and admire the divine wisdom in the same. Had God permitted and enabled Adam to stand, all his posterity had been eternally happy. Adam had then been in a very real sense their savior, and while enjoying everlasting bliss, all his posterity would have exclaimed, “For all this we are indebted to our first parent.” Ali, what anointed eye can fail to discern that that would have been far too great a glory for any finite creature to have borne. Only the last Adam was entitled to and capable of sustaining such an honor. Thus, the first man, who was of the earth, earthy, must fall, so as to make way for the second man, who is “the Lord from heaven.” A.W. Pink, Part Two: The Adamic Covenant
(Underlined emphasis, mine.)