there is some bullshit up in that video, like kids who don't play video games being at greater risk for violent behavior -- all this is really saying is that if you don't play video games you're more likely to have a social behavior problem. It's not to be taken to mean that if kids who don't play video games started playing video games they'd stop being violent, it just means that not playing video games is a good indicator of having problems interacting socially.
The research also didn't seem to focus on causality, if they were only doing questionairs and surveys etc. then they are limited to making correlated claims. This dosn't seem enough to disprove the evidence that the other college studies have done to show the causal relationship. -- Granted they do have a solid point that the majority of psych studies done are only really relevant to the psychology major freshman, but those tests actually get at causality. I also remeber older reserach expieriments where the researchers would show violent clips or cartoons whatnot to kids, then leave them alone in a room with a "punching doll" (inflated clown ballon thing, with a weight at the bottom so you can punch it down and it'd return to it's feet) and the kids who watched the violent clips were more likely to attack the doll.... again there is reserach that does show that violent media does cause violent reactions.
i think the video is interesting, and that it definitaly sheads light on the subject. I think it opens up new directions for research. But i don't think that it's the end all be all on violent video games -- it dosn't mean that we're going to stop blaming them for violence. Then again when the media talks, what they say and what psychologists say is often times open to large discrepencies anyways.