God's knowledge of the future

Hello Rabbi
I saw in one of the lessons that you said that God cannot know the future until an actual choice has been made, and that this does not detract from His power, etc.
I wanted to know how this fits with the following verse:
And he said to Abram, "Know for certain that your seed will be a stranger in a land that is not theirs, and they will serve them and afflict them four hundred years."
And also the nation that they will serve, I will judge, and afterward they will come out with great wealth.
And you will return to your fathers in peace, and you will be buried in a good burial.