This is a useful review of the most recent studies into asymptomatic infection.They suggest we may have to prepare for long term consequences of asymptomatic infection, even in children.
Where does it specifically suggest this in the two child studies in your link?
("Two studies have reported the same pattern in children with asymptomatic COVID-19 infections in Wuhan, China.")
Extracts from the two studies:
"Despite the delayed NAT conversion, chest CT abnormalities and clinical symptoms did not worsen, implying that COVID-19 in children is a mild disease with a good prognosis." ...
"In summary, a pediatric case series of COVID-19 was described. Although similar to adult patients, pediatric patients tended to experience mild manifestations of COVID-19. Regarding CT features, small patches of GGO with subpleural distribution and unilateral lung involvement were common findings in pediatric patients in the early stage of the disease...All exudative lesions were substantially resolved after treatment, and patients had good prognoses." ...
"CT Changes in Follow-Up Imaging"
"Regarding disease treatment, vitamin C was administered to the two younger patients, while arbidol was administered to the other two older patients.The follow-up CT imaging after treatment revealed that all the pulmonary exudative lesions were substantially resolved." ...
"In summary, COVID-19 in children of Xiangyang city is generally family acquired and often not serious, with a good prognosis. Asymptomatic children can be diagnosed as pneumonia because of chest CT abnormalities. Atypical symptomology and nonspecific laboratory findings tend to muddy the diagnosis, especially if the sole manifestations are chest CT changes."
Conclusions -
"COVID-19 in children of Xiangyang city is often family acquired and not serious, with favorable outcomes. Asymptomatic children can be diagnosed as pneumonia because of chest CT abnormalities. It is essential to actively screen this segment of the population."
Both studies conclude that children may be asymptomatic carriers of the virus and this should be investigated - but they haven't cautioned about long term health consequences in children - in fact quite the opposite, as far as I can see.