Thanks for the links-I've had quick look.
www.statista.com/statistics/1107913/number-of-coronavirus-deaths-in-sweden-by-age-groups/
^^These are mortality statistics, not spread of infection in relevant age group. We already know children experience covid symptoms far less severely than adults and the mortality rate is far lower.
www.reuters.com/article/us-health-coronavirus-britain-epidemiolo-idUSKBN22V1K1
From article: "There are hints that children are less infectious but it is not certain."
medicalxpress.com/news/2020-07-commentary-pediatrics-children-dont-transmit.html
"...that children infrequently transmit COVID-19 to each other or to adults and that many schools, provided they follow appropriate social distancing guidelines and take into account rates of transmission in their community"
www.bloomberg.com/news/articles/2020-06-23/school-children-don-t-spread-coronavirus-french-study-shows
From article: "The data on kids has been contradictory so far, with some reports corroborating the Pasteur findings and at least one pointing the other way."
"And more studies on schools were needed because of the small number of cases they were able to study. They found that an estimated 41% of the children infected showed no symptoms, compared with about 10% of adults."
pubmed.ncbi.nlm.nih.gov/32513410/
"In summary, all the 455 contacts were excluded from SARS-CoV-2 infection and we conclude that the infectivity of some asymptomatic SARS-CoV-2 carriers might be weak."
^^Sample very small. Schools not even mentioned.
ieureka.blogs.bristol.ac.uk/2020/05/26/are-teachers-at-high-risk-of-death-from-covid19/
^^This applied to mortality of teachers rather than spread of infection although it does say that "current evidence, although inconclusive, also suggests that they may be less likely to transmit the virus than adults."
www.rcreader.com/commentary/masks-dont-work-covid-a-review-of-science-relevant-to-covide-19-social-policy
^Interesting. Says even N95 and all other respirator masks "do not work to prevent respiratory influenza-like illnesses, or respiratory illnesses believed to be transmitted by droplets and aerosol particles."
And yet, other studies say otherwise. For example:
www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)31142-9/fulltext
There are always going to be studies to support or refute a line of thinking.