Can't speak to the nature of the problem in the US, but the "Digital Divide" is without a doubt a real thing.
Not really a race issue, although no doubt it's not evenly
distributed.
A lack of basic IT literacy by highschool is the modern equivalent of still being unable to read and write, given the nature of the information age.
It's not just with the younger generations either. Plenty of capable older workers who I've seen passed over for positions because of their unwillingness or inability to update their IT understanding to the basic levels needed for modern management.
It's all well and good to limit kids screen time and encourage a more active lifestyle, but if you take it to the extent that they aren't capable of competently using a computer, especially with the brighter kids, you're absolutely closing doors on them.