Progressive revelation does not mean that further revelation shows that what was formerly revealed is false. That is absurd; look up the definition of "progressive revelation". Progressive revelation builds on and clarifies what has previously been revealed. We read in the scriptures that things in the OT are shadows of things to come. A shadow is a dim outline of a real thing. Progressive revelation provides a clearer picture than a shadow; it doesn't falsify what was revealed by the shadow.Like you, I also believe in progressive revelation. But doesn't that imply that the earlier understanding could be in error?
It would be well to consider Paul's application to us of what God did to those wandering in the desert. Paul doesn't think Moses got it wrong:
1 Corinthians 10 (NASB)
10. For I do not want you to be unaware, brethren, that our fathers were all under the cloud and all passed through the sea; 2. and all were baptized into Moses in the cloud and in the sea; 3. and all ate the same spiritual food; 4. and all drank the same spiritual drink, for they were drinking from a spiritual rock which followed them; and the rock was Christ. 5. Nevertheless, with most of them God was not well-pleased; for they were laid low in the wilderness.
6. Now these things happened as examples for us, so that we would not crave evil things as they also craved. 7. Do not be idolaters, as some of them were; as it is written, “The people sat down to eat and drink, and stood up to play.” 8. Nor let us act immorally, as some of them did, and twenty-three thousand fell in one day. 9. Nor let us try the Lord, as some of them did, and were destroyed by the serpents. 10. Nor grumble, as some of them did, and were destroyed by the destroyer. 11. Now these things happened to them as an example, and they were written for our instruction, upon whom the ends of the ages have come. 12. Therefore let him who thinks he stands take heed that he does not fall. 13. No temptation has overtaken you but such as is common to man; and God is faithful, who will not allow you to be tempted beyond what you are able, but with the temptation will provide the way of escape also, so that you will be able to endure it.
Are we to think that those things that happened as an example to us just happened by chance, that God's had was not in it?