It is the same result, just that they added the "unskilled" category. People who never drove a car will rank themselves as the worst drivers, and people who are

It is the same result, just that they added the "unskilled" category. People who never drove a car will rank themselves as the worst drivers, and people who are experts rank themselves highly, so the most overconfident are those who can drive, but drives poorly, ie "intermediate skilled" relative the whole population.