ummm, that's not the way it works. He said his UMMU's died after an impact of 5 m/s, not from five meters high. You do indeed reach a velocity of 4.9 m/s after a fall of about 1.2 meters on the earth surface, so his UMMU died after falling 1.2 meters. (5 meters would be an impact velocity of pretty much 10 m/s, since it takes you slightly longer than a second to fall).
The problem is of course that this might be realistic if the UMMU fell on the head... which the code doesn't check, of course. A moderately trained person can handle falls to two meters on their feet with relative ease (no problem if you land correctly, serious risk of injury if not), but has a hard time surviving a fall straight on the head from half a meter, so I guess the UMMUs would have to check for their alignement, but this isn't an athletics simulator, after all...