It's FOREKNOW, Rnnie. It's about knowledge.
The answer to your question: Because, foreknowledge is not the same as ACTION, Rn. When he foreknew it, it HAD NOT HAPPENED YET.
The predestining is the step that makes it happen. What God saw as a vision, he implemented in the predestining.
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When Jesus says, 'Depart from me I never knew you.' Is that about knowledge too? Absolutely not. It is relational.
What did God see in a vision; did He observe the "future" or did He create the "future?"