Actually, the 200 million visitors is an incorrect interpretation of the way Alexa reports stats.
Alexa is not saying there's been 285 million visitors, they're saying that "Reach measures the number of users. Reach is typically expressed as the percentage of all Internet users who visit a given site. So, for example, if a site like yahoo.com has a reach of 28%, this means that if you took random samples of one million Internet users, you would on average find that 280,000 of them visit yahoo.com. Alexa expresses reach as number of users per million."
In other words, for every 1 million visitors who visited a web site somewhere on the web, 285 would have ended up at DNForum. That's a reach of 0.0285% or 1/3509. So if there were 100 million visitors across all the sites Alexa tracks, 28,500 came to DNForum.
I know it's just an honest mistake by DNForum's owner, but I think it would still be better to fix the statement since anyone who understands Alexa will know that it's wrong.