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It's worth noting that most kids don't have symptoms, and it's considered less worthwhile to test kids. So I'd assume the cohort of kids who are tested for COVID-19 are a heck of a lot more symptomatic than the child population at large (and that this is more exaggerated than the selection bias for adults who want a test).

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I don’t think there is any evidence of that.

There tots is. :P e.g. Serosurveys of kids show significantly lower positivity rates than adults (fewer kids have had it); PCR testing of kids shows higher positivity rates than adults (a greater proportion of kids tested have it); other studies show seroconversion rates of kids are nearly as high as adults after infection.

The only way to get this outcome is if negative kids are less likely to be PCR tested than negative adults, or if positive kids are more likely to be PCR tested than positive adults, or both.

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