Interesting article. You mentioned 133 children have died as a result of Covid-19. This seemed quite high on first reading. Can you clarify where this number is from? according the the ONS (https://www.ons.gov.uk/aboutus/transparencyandgovernance/freedomofinformationfoi/covid19deathsinukforchildrenfromages0to19sincemarch2020) up to May 2021 the number seems to be 13 in age group 1-15.
Another study (https://www.nature.com/articles/s41591-021-01578-1) quotes a figure of 25 deaths in the under 18 group between march 2020 and feb 2021
Also excess mortality (rather than mortality per se) is a more accurate indicator of the risk to children. It is interesting to note that during 2020 the mortality rate was the lowest on record since at least 2015 for the 1-15 age group