When they are saying this is less severe - is that based on ~20% of the country having Covid or ~80%? There are these estimates that ~80% of SA had Covid. If

When they are saying this is less severe - is that based on ~20% of the country having Covid or ~80%? There are these estimates that ~80% of SA had Covid. If so - previous variants were 1/4th as severe - since 3/4ths of the cases went undetected... Right?