I look at this, and I see that this study might not be as flawed as it is stated to be. Like- it isn't like the only question asked was "do you lie to your mom about your homework to play video games"
It measured a whole bunch of factors- and most likely, there are those who have skipped school, bring their DS / gameboy / tomogatchi / PSP to class... have gotten suspended for repetitive electronics violations yada yada.
As most people can figure out- the more someone does xyz instead of school, the lower school grades are going to be for most individuals.
91 % of children play games and are perfectly fine. But, there is that 1/12 kiddo that is seariously suffering because they can't / won't put the game down. Yeah, I've known kids to miss meals because of games... I've known college kids to flunk out.
There are all kinds of addictions in the world. From drugs, caffeine, cigarettes, gambling to oh things like anorexia, bulimia, cutting, speeding...
Video games probably fall in there somewhere. The question really is how many? And, is there a way to reduce addictive behaviour in children? But- there are simply people out there who get addicted to things. Some manage just fine in the world, 'functional addicts' and some end up on crack on the street corner talking about bugs. It just depends.
Overall though, on the scale of addiction harmfulness, video games probably isn't that high on the list on the road to self destruction.