The article drums that line, but the research cited says that screen time is irrelevant. They also didn't measure screen time, they relied on parents self-reporting which may be very high or low (reflecting parental self-image,not actual screen time). And the research didn't look at long-term effects, only short-term. And it waved off that high screen time may be merely correlated to poverty and unengaged parenting, not literally strictly screen time. The research isn't an endorsement to let little kids stare at tablets all day.