The list is from 2006. It would be interesting to see the current numbers for Brazil and Russia given their supposed ascendancy. Plus, half the world's population live in China and India, neither of which is on the list.
It's the top 50 countries, ranked by computers per 100 population. China and India are still quite rural. I would not expect a significant percentage yet.
I don't know about Russia, but the number for Brazil doesn't sound too farfetched, the percentage of people in the middle class there is rather slim compared to percentage of poor people, even today.