I assume it means the average speed between two points. The article doesn't mention the distance so I'm not sure. But in order to average 199, it means that he would have to have driven faster at some points and slower at others, and again there's no indication of what the variance is between the two extremes. It's still irresponsible if there were other cars around, because they too may not be well trained in reacting to speeding cars.
If you want to speed then that's fine, but keep it reasonable and relative to traffic flow. If the road is empty then go ahead, but as soon as there is the possibility of passing another car, slow down and be reasonable.