This does seem likely, but the paper claims to have taken it into consideration: The authors acknowledged that the age structure of a country, as well as its r

This does seem likely, but the paper claims to have taken it into consideration: The authors acknowledged that the age structure of a country, as well as its relative wealth and reporting capacity, has an impact on covid-19 cases, hospital admissions, and deaths, but said that their findings seem to be independent of these contributory factors.