On the post-human prostheses thing:
Say some parts on my car were damaged. And instead of buying the usual, factory-made replacements, I made some parts myself. Serviceable, but not as long-lasting or high-performance as what they sell at the auto parts store. Or maybe they are longer-lasting, but don't fit as well, or don't allow me to drive as fast, whatever. Maybe I can go faster now, but braking is less reliable. And so on and so forth. None of that makes my car post-automotive. It probably doesn't make it post-internal-combustion, either, which is about the only thing (besides flight or maybe auto-pilot) that would be a truly transformative leap in car tech.
Or let's say I found/made some parts that made my car perform better, go faster, save fuel, last longer, etc. That's still just an enhancement of what a car is, until I turn some corner like the ones I already listed (new power source, flight, etc).
That's how I see the people in those pictures; just as human as I am, no more and no less. Like a car with a coat hanger holding the muffler on, or with duct tape around the radiator hose. It will still do what a car does, but it has more challenges. It's not a game-changer.