Not sure what Maximum PC is thinking, but all that I have heard including stuff from this website says the opposite.
In any event, if their testing says something different and it is well done then I can respect that and if so then it probably doesn't really matter too much either way.
- Edit - I read the beginning of that article you linked. There it did say (paraphrased), "Getting hot air out is more important than getting cold air in". Getting the hot air out is negative pressure and getting the cold air in is positive pressure. At least on that basis the article seems to somewhat agree with me.
- Edit 2 - I read a little bit more in the article, and they kind of glossed over something of major importance which is why it makes the positive pressure setups look a whole lot more attractive than they really are. They said that all vents that can be uncovered are uncovered during the testing. This includes the top vents. Hot air rises so plain old holes in the top of the case double as "exhaust fans" in a sense. They don't suck air out, but they do prevent air that is being pushed in from becoming trapped in the PC. Plenty of air escapes through these fan-free holes, though not as much as what comes from a dedicated exhaust fan. That means some setups potentially are benefiting from 2 or 3 exhaust ports that aren't directly mentioned in the article. The existence of these open vents does a lot to mitigate the negative effects of too many intake fans in relation to exhaust fans.