If those conclusions are accurate, I should certainly be concerned about my mental well-being, as should anyone who's even moderately tech literate or employed and using the Internet to do work, for that matter.

And college students who watch a lot of videos and spend too much time gaming and chatting is abnormal?

There are some obvious problems here.

For one thing, the researchers aren't psychologists -- one is an assistant professor of computer science and the other is a software development engineer. You'd think a psych background would be a requirement for publishing a study on the subject of depression.

Second, there very may well be some bias involved in their conclusions.