By "narrative", I assume you mean the idea that "Covid doesn't affect the young by very much". Taken as a proportion of total Covid deaths, that is very true.

By "narrative", I assume you mean the idea that "Covid doesn't affect the young by very much". Taken as a proportion of total Covid deaths, that is very true. Given that practically no young people die in developed countries, it doesn't take much to make a big change to the excess mortality figure for that age group.