Free will largely isn't about making choices or having choices. It is largely about how/why we make choices.
Bacteria can move, thus bacteria have a choice of direction in which to move. Bacteria move, so it is making a choice.
If GP has free will just because they made a choice to write a reply to you, as you claim, then it must follow that bacteria also have free will. Am I wrong or do you think that bacteria have free will?
As for reflex versus choice, if someone hits my knee just right my legs going to kick out. If someone pushes in the same spot and says “kick your leg out” and I don’t want to, I don’t have to.
There may be constraints on that, obviously at gun point I’m going to, but yah, if you’re able to think about then choose to do something or not do something that seems qualitatively different than a reflex.