Agreed. It seems odd that the countries author chose to highlight are not special for much of anything but their size. If you are going to go for small countries, might well talk about individual states, prefectures, counties, etc. I bet if the Governor of Hawaii was a "Mad Despot" he could turn off the internet just as well as President of Iceland.
PS. Greenland is really odd, because it is part of Denmark. Why did they break it out separately?
Because it is an extreme case: small population, almost no diversity, and on an isolated island. There aren't many internet connections to Greenland and there isn't much demand for different ISPs either. So cutting a cable or an ISP off of the Internet cuts off the whole country (it's an autonomous country).
So, a mad despot or a sloppy construction worker could cut Greenland off of the internet.
Another interesting case mentioned in the Article is The Netherlands: a small country, a small population, but a enormous amount of ISPs and connections to other countries. Good luck cutting that off as a whole, you mad despot!
PS. Greenland is really odd, because it is part of Denmark. Why did they break it out separately?