That's a good point, but the solution is supposed to resolve the inconsistency between foreknowledge and free will by saying there isn't any foreknowledge. God doesn't know what you do before you do it, but as you do it, it's just that you're always being born, choosing to sit, choosing to stand, and dying from God's perspective. So he sees the timeline of the universe all at once.
In the same way, if I see you sitting and then see you stand up, I know you are now standing, but my knowledge doesn't make you stand. I know because I see you do it, of course if I knew before you did it and my knowldge could not be wrong, then my knowledge would necessitate you standing.
From our perspective he does know what we do before we do it, but I don't know if that is enough to make the solution fail.