Wouldn't this still be useful information as a diagnostic tool? If someone is on a screen for 7 hours a day, it's twice as likely they're depressed. That seems worth disseminating.
The original title was "There’s Worrying New Research About Kids’ Screen Time and Their Mental Health." My point is that the article doesn't have anything worrying in it. Having a new diagnostic tool isn't something to worry about. If anything, it's the opposite.
Or a person who expresses their depression in an obvious way, like spending 7 hours a day in front of a screen, might be more likely to be noticed and helped toward a diagnosis.