Or he could have created Scripter's parents with free will and with it they chose to have Scripter with God-given free will and so on and so on, all the way back and all the way forward.
That Scripter is a degenerate reprobate can be both foreknown and still partly a result of free will choices along the way.
We can have "free will" all over the place, and it doesn't affect what God does or does not know. If you change you mind 20 times today about whether you will or will not go to the grocery store this evening, does God know what you will end up doing?