Does this study really account for the fact that depression is a common co-morbidity for ADHD? And that ADHD leads itself to people getting depressed? Sounds l

Does this study really account for the fact that depression is a common co-morbidity for ADHD? And that ADHD leads itself to people getting depressed? Sounds like they just did a meta-analysis and saw a link between ADHD and depression and blamed the med.