In the third link provided, the ages of the deaths are 23 and 20 and morbidly obese. It was news because they were siblings, but they weren't children. I don't think there is any "seems like" as far as kids not reacting as severely to COVID19, they pretty obviously do not. In the 26k+ cases under age 18, 6k of which under under 5, in California, there are 0 (confirmed) deaths. As far as where the breathless media coverage is, I'd say it's pretty much there. Youth deaths are individuals that get big headlines, which is "good." If that's the case it's still very rare.