It's not exactly true though. Open theists maintain that the future is a realm of possibilities, and God knows those possibilities. The future is "open" however because while God may know the endless possibilities, the future is not settled, meaning your choices are not exhaustively foreknown, only potentially foreknown. In this sense, God does not know the future because the future literally does not exist; it is not actualised until it comes to pass.
On the other hand, the way I'm seeing it, Molinism does claim the future is actualised - it already does exist. However, it was the best possible world to actualize based on God's endless knowledge of all possibilities.
However, as soon as you speak of a non-linear relationship, it seems to me you are speaking in terms open theists would use. Under Molinism, how is the relationship non linear? Given that time is still linear on Molinism, as God perceived all possibilities logically before creation and actualized the best possible outcome (under Molinism) this would still imply that the future is as linear as the past and is, in actuality, determined.
Based on those use of words and your explanation, you seem to me to not be Molinist, even though you think you are. I could be wrong though, so not making claims on your position, just observations.