"Progressive revelation" is a convient concept invented by Christians to explain why the Tanach doesn't fit with the NT.
The Old Testament has progressive revelation. Does the Bible teach that there would be two comings of the Messiah? | GotQuestions.org
the knowledge that the Messiah would have two comings came to humanity gradually, as God’s revelation to mankind was progressive.
The Old Testament clearly teaches that the Messiah would come, but it does not explicitly say that He would come twice. The information God revealed about the Messiah started very basic, with more detail added bit by bit. People living in later times knew more than those who lived earlier. Abraham knew more about the purposes of God than did Noah. David knew more than Abraham. The prophets knew more than David.
The revelation concerning the Messiah progressed over time. Genesis 3:15 is a cryptic first promise of a Messiah. The seed of the woman will destroy the seed of the serpent. Who the seed of the woman is or how He will accomplish His mission is not revealed. Later, David is promised a lasting dynasty, which means that one of his descendants will reign continually. Again, we are not told exactly who this will be or how it will come about. Sometimes, the prophets speak of this reign as if God Himself will sit on the throne (Zechariah 14). At other times, the prophets expect a descendant of David (Psalm 2). Again, the prophets never explain how this will all come together.