They've also not talked to any kids and tried to ascertain which proportion of the kids involved 1) see it as a problem, and/or 2) exhibit behavior that suggest

They've also not talked to any kids and tried to ascertain which proportion of the kids involved 1) see it as a problem, and/or 2) exhibit behavior that suggests it might be a problem. It's pure speculation until they've actually asked follow-up questions. An article about the results of Dr Rich, quoted towards the end, sounds like it'd have had far more meat on it, but given it's The Guardian they'd lose the hook of it being about "almost half of British teens".