I think there may be some truth to this rumor. I do a lot of advertising on TrafficVance which is basically pop-up advertising on computers with adware. One thing I noticed regarding the traffic I received to my landing pages was that a disproportionately high number of my visitors were using Internet Explorer. The percentages were so disproportionate that some of the advertisers I was working with flagged it as "suspicious." (This was thankfully cleared up when I explained to them how I get my traffic.)
For whatever reason, it seems like more Internet Explorer users have adware on their computer than users of other browsers. To me this shows that users of other browsers are more technologically literate than IE users, as you wouldn't expect a technologically literate person to have adware on his/her computer.
Does technological literacy correlate with intelligence? I don't know, that's not really for me to say, but I don't think we should be so hasty to dispel this notion simply because a study was faked.