Life expectancy is computed as if the model person lived all their life years this year. This means that when e.g. a new communicable disease appears which is m

Life expectancy is computed as if the model person lived all their life years this year. This means that when e.g. a new communicable disease appears which is more risky the first time one falls ill, its effect on life expectancy is outsized: we sum up the risk from getting that disease _for the first time_ over all years of life. A year later, we sum up delayed effects of getting it for the first time, etc. The article doesn't seem to address that at all.