Assumptions 4. A civilisation or intelligence which has been able to exhaustively map the material composition and configuration of the universe over all of time will also be in a position to recreate entities including people from the past by recreating their exact material condition.There is your mistake right there.
Identical twins or clones - identical twins born at different times - are still different people with unique experiences. A unique human being is an impossibly complex interaction between nature and nurture.
I also think you have a simplistic, caricature-like perspective of a deterministic universe.