The Bible sure does not agree with the Watchtower, like that is a surprise.
Matthew 6:14 "For if you forgive men their trespasses, your heavenly Father will also forgive you.WEB
Mt 9:6
But that you may know that the Son of Man has authority on earth to forgive sins..."WEB
Mark 3:28-29 Most assuredly I tell you, all of the children of men's sins will be forgiven them, including their blasphemies with which they may blaspheme; but whoever may blaspheme against the Holy Spirit never has forgiveness, but is guilty of an eternal sin"WEB
Psalms 32:1 <<By David. A contemplative psalm.>> Blessed is he whose disobedience is forgiven, Whose sin is covered. WEB
Ephesians 4:32 And be kind to one another, tenderhearted, forgiving each other, just as God also in Christ forgave you.
1 John 2:12 I write to you, little children, because your sins are forgiven you for his name's sake.WEB
Psalms 103:12-13 As far as the east is from the west, So far has he removed our transgressions from us. Like a father has compassion on his children, So Yahweh has compassion on those who fear him.WEB (World English Bible)
The Bible says that those who remember your sin are agents of the enemy.
2 Corinthians 2:10-11 Now I also forgive whomever you forgive anything. For if indeed I have forgiven anything, I have forgiven that one for your sakes in the presence of Christ, that no advantage may be gained over us by Satan; for we are not ignorant of his schemes.
Verse 11. Lest Satan. The devil. The name Satan denotes an adversary, an accuser, an enemy. It is the usual proper name which is given to the devil, the great adversary of God and man. Barnes
Thus the WTBTS is an agent of Satan when they keep records of sins.