"Those are predictions about the past, not about the future."

So Deuteronomy 28 predicted the scattering of the Jews to all nations of the earth. Then in Deuteronomy 30 it is predicted that they will be gathered from all nations of the earth (as well as if they are driven to the outmost parts of heaven they will be gathered from their). The Jews during the Roman times were scattered (documented fact) to all nations and have more recently begun to be gathered again to their ancient lands. (see Isaiah 11:11 as well).

That was a prediction that up until this last century was about the future, and a prediction that the century before was considered impossible. Take from it what you will.