You know what does more to promote creativity? Creating stuff.
My brother and I used to create board games, write comic books, make TV shows, build tons of original things and cultures out of legos, and draw a bunch of stuff.
What are they comparing the "Promoting Creativity" to? I bet it's vegging in front of the TV. Did anyone check to see if the things drawn in their creativity test or stories about them were original or were they copied from video games? Because that wouldn't be creative.
A SCIENTIFIC study needs a CONTROL group. If you don't tell me what the control group is, then I will just assume you don't have one. And if you don't have one, then this is not scientific, which means it's just speculative B.S.. Of course, you could already assume that since the study wasn't to see what people who are more "creative" do with their free time--it was to see if they could link video games to creativity in a non-scientific study.
I don't appreciate things that impersonate science to make it appear as if science itself has ulterior motives. Science is a process, like an algorithm...it is inherently unbiased, but can be misrepresented by the ill-informed (e.g.: studies setting out to prove something instead of disprove such as those ran by the Creationism Institute. I'm not knocking Creationism--but it's a good example of attempting to prove something when they should be attempting to disprove the alternatives like Big Bang Theory or Evolution if they want to be scientific. Otherwise you're just being speculative.)