I'm afraid that you have managed a worse post than the OP - even the title is a strawman. It is not the act of prediction, but the ability to do so that is the issue (although making such a prediction to one of the people involved does raise related issues)
Firstly, let's make the point that prophecy is supposed to be absolutely reliable. That sets it apart from ordinary predictions of human behaviour.
Prophecy, then, requires a degree of fatalism - the prediction must come true
no matter what anyone does. This might or might not interfere with concepts of free will, depending on what is predicted and how much it depends on human actions. Any dependence at all would call libertarian free will into question, if absolute reliability were required.
The most extreme example I know of the Bible is the prediction attributed to Jesus, that Peter would deny him three times before the cockerel crew. This certainly seems at odds with any idea of libertarian free will, relying on Peter to not work against the prediction and that exactly three people would ask and meet denials in a quite limited timeframe. Even a fully deterministic view of the universe would make it hard to be able to make such a prediction, even for a being capable of modelling all the relevant factors to test what would happen if such a prediction were made. Thus, such a prediction would call even compatibilist views of free will into question, at least with regard to this event.