eseedhouse repeatedly states if a car hits a pedestrian, they stand a better chance if that car is travelling at 40kph than 50kph. I won't argue with that, but I am still unclear as to how the increased limit equates to a greater risk of the car hitting the pedestrian in the first place.
Clearly your stopping distance and time is increased if you are going faster. Ergo easier to stop or avoid a pedestrian.
I'm sure your counter argument probably has merit: speed differentials are bad even for pedestrians as they can't judge car distances reliably, and going too slow sometimes leads to distraction and less attentive driving. However, that requires a bit more proof and psychology than the simple physics that says moving things around slowly is safer than moving them around quickly when your control system has a finite response time.