The researchers focused on two outcomes of the DAWBA: risk for depression, and risk for “conduct disorder,” which is a term describing antisocial behaviors in children.
Finding no significant correlation between video gaming and those outcomes does not really prove the broad conclusion of the headline that "Video Gamers From the '90s Have Turned Out Mostly OK".
Right. And I don't think the supposition has ever been that video games increase the prevalence or incidence of any particular disorders in children, but rather what negative (or positive?) effects certain types of video games and length of time playing would have on children already prone to behavioral or psychological issues. Whether gaming (amount of time spent, and types of games played) makes things better or worse for those kids both in the short term and longer run... But good luck finding a control group. Really you are going to have to just look at estimated time spent gaming along with preferred games to make any meaningful comparison.