That doesn't matter. He's saying that if the "EC Econoboxes" were driven like US cars are, the fatalities would be much worse. Around here, a lot of people commute on the Washington Beltway, which is a pretty crazy road to commute on. I once had someone pass me on the left when I was in the left lane. In other words, I was doing 60-ish mph in the left lane approaching a left exit and someone was so impatient he passed me on the shoulder. Do as many people in the UK drive on these massive and complicated interstate-style highways? That would make a difference. If I'm driving 1000 km back and forth to the market, it's probably going be less dangerous than 200 km in 120-kph rush hour traffic and rampant road rage.
I'm not saying he's necessarily right, but he didn't disprove him own point. Maybe the UK just has much, much safer drivers and cars than the rest of Europe (since most of the worst countries listed are in Europe). Maybe it's driving on the left. Maybe it's the better beer. [shrug]