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The air density at sea level is ~20% greater than that at 4500 ft, so the 200 lbs, .0005 crr, .11 cd, 4 sf vehicle at sea level requires 800 watts to go 71 mph. In the thinner air it goes 15% faster (82 mph) for the same power.
It looks like they had a clever 'starter' motor--a big-legged sprinter pushing a thin inline skater pushing the vehicle. i reckon they might get him up to nearly 40 mph before he had to start putting his legs into it.
An awesome achievement for sure...
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