This claim is opinionated! The claim about a study showing children who play video games for three hours or more a day performing better on cognitive skills tests related to impulse control and working memory needs to be verified. Such a study might exist, but it would require a careful look at the specific methodology, sample size, and the conclusion to confirm whether it supports this broad assertion.
The statement that children playing 3+ hours of video games per day perform better seems to contradict some other research, which suggests that excessive screen time can have negative effects, particularly on children's health and cognitive development. So, confirming the context and scope of the study is crucial.