This article is virtually meaningless if it doesn't state the conditions under the tests are carried out.
FACT: the rate at which you receive data on a broadband connection is ultimately determined by the server or peer-2-peer connection you're downloading from.
Only a dedicated server network for testing download speeds can provide any reliable information on your network speed, MySpeed PC Light http://myspeed.visualware.com is a good service, though again they are only as good as their servers can keep up with demand. The more people start to use them, the more work their servers have to do, the slower data is served. You should also average over a number of trials to reduce stochastic effects, I doubt very much whether this was done here, anybody who went to any effort would be sure to mention it. Even more thorough would be to compare all the Internet speed testing services, since there are a number of them - you should never base all your results on just one diagnostic - to do so would be scientifically illiterate, giving rise to suspicions rather than reliable facts.
Reliably testing broadband speeds is not a simple black and white step.