Those kids have access to health care.
How many of the parents know how to spot the problems? Do they know when to get their kids into a professional?
Researchers have documented many of the causes yet we rarely talk about them or do anything about them. For example, smart phones and social media are a major factor. This was first correlation and then researches later figured out the causation.
How come we don't even talk about what's causing this?
Looking just at the means by which we get healthcare isn't going to fix all the things. We need to talk about the other elements and do something about them if we want change.
Maybe access to more healthcare would help, though the US already uses more healthcare than almost any other nation, but I suspect, like the rest of health, the real gains are to be found elsewhere, and this is a huge canard so people can feel like their pet political policy will solve something real.