The Grounding Objection to Molinism

I was going to ask again about the difference between divine foreknowledge and causal determinism because I could imagine someone saying well causal determinism doesn't rule out free will we should be compatibilists instead of libertarians. If you're causally determined to do something you'd have to have some sort of a backtracking counterfactual there that would not be justified, he says. So that suggests that it is really that it's God and it's knowledge of the future that God has that plays a special role here.