This fallacious position confuses judgment with forgiveness.
The Cross was all Judgment. Forgiveness doesn't occur until the sinner faces God, recognizing through faith in the Judgment of Christ on the Cross, that all sins have been judged, and that by confessing His sins to God through faith in that Judgment, God is now free to forgive the sinner and then give that sinner a regenerated human spirit, thereby providing salvation.
Christ was judged for all personal sins, past, present, and future in all humanity. Forgiveness of the condemned is still required prior to salvation.
Did you bother considering the passages I referenced or the link I included?
Your position means that God the Father poured His wrath on Christ for the sins of all the damned who died before Christ ever walked the earth. Why would Christ pay for sins of those already doomed? In your view, He punished Christ for the sins of those wiped from the Earth in the judgment of the Great Flood. In your view Jesus bore the sin of Hitler, Mao, and Stalin. The Bible never teaches any of that. It does, however, plainly teach He died for His sheep and that He actually saved them.