Interesting article, although over 2 years old. The server distribution probably still stands. Apache being predominant, this alone could be grounds to say people use it most, although on the server side, therefore it is out of end-user control.
If the original advertisement meant to include distribution of malware, then IIS would be the best candidate for that, considering the proportion of malware distributed in comparison to Apache.
Having these statistics, the original advertisement would be shooting itself in the foot trying to say something opposite to plain evidence...