It’s talking about parents giving 1 year olds and 2 year olds 1-4 hours of screen time a day. That amount of screen time for developing humans who sleep for a substantial part of the day is most likely poor stimulus in my opinion. I don’t see how you are jumping to parents prone to producing developmentally delayed children. You call nature. I call nurture. But just to check, which parents are more prone to producing children with developmental delays?