Where does it mention any speeds???
It talks about accelerations!
If the impact only lasts for 1 msec and in this time it goes from 8.33 m/s to 0 m/s you already have your 850G. In normal gravity it picks up this speed in less than a second. So, pretty good for normal handling accidents (dropping a notebook on a carpet floor) but easy to exceed by throwing it out of a window on a concrete floor.