Earlier quoted context omitted.
Average parents?
That just can't be the average. That must be the very top of the curve. For it to be the average, with the very bi-modal distribution coming from parents who have no-screens policies, the average in that other cluster would have to be like 8 hours a day. I just don't believe that's possible with any frequency.
If no-screen parents only represent 10% of the total population, they're not going to do as much pulling the number down as you might think. There's no way there's an equal distribution on this stuff among between "none" and "some" so they won't weight as heavily towards lowering the curve. Also, it's a pretty wide age range. What people allow a 2 year old vs a 5 year old to do/consume is a world apart.
There's all sorts of things that go into it. I agree, without deep diving into methodology, these numbers are a whole lot of "but what does this actually MEAN"?