Agreed.
So, the heading 'South Africa's Largest Websites' are incorrect. The stats are distorted and do not take into consideration other websites that may have a huge impact on the top sites mentioned by the DMMA.
I would strongly recommend that MyBB make a heading stating that this is only the DMMA's stats, which is not accurate. It should also clearly be mentioned that only a very, very small portion of SA websites are measured and it only applies to DMMA members and not the Internet as a whole.
This may be interesting reading for DMMA members but are very misleading to the public who has nothing to do with the DMMA and their members.
Alexa.com will probably be a better measure to indicate SA's top sites, however, even they are limited -
http://www.alexa.com/topsites/countries/ZA