Why does Paul The Apostle note it's by u-sing of laws that all perish in Colossians 2:20-22 ... Revelation 15?

because the law has no mercy, it has to give you your rewards for your deeds, that's why Jesus came pay for it all of at once by dieing on the cross. This concludes to your are are justified by faith. Even when the Jewish people did sin offering it only covered them, but never forgotten but with believing in Jesus, they are forgotten forever, because he is God manifested the flesh 100% which mean he's eternal, and so you sins are forgiven past, present and future.