[johnfn]

The study considered "screen time" as an unvariegated whole[1]. That is confusing. Screen time is not a singular activity - there's an infinite diversity of things that you can do on a screen - some great for your health, other very poor.

It'd be like a study came out saying "food proven to make Americans overweight" because, on average, people eat junk food. Strictly speaking that is true, but it's not useful information.

[1]: Alright, it considered "non-work screen time" as an unvariegated whole - but my point still stands here.