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This isn't how the math works.

The reason why life expectancy is going down is because middle age people are dying. People dying in their 80s has almost no impact on life expectancy calculations

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Isn’t life expectancy an average? If so, then reducing any input values (people dying earlier than they otherwise would) would reduce the average. Doesn’t matter in which n-tile the reductions occur.

Wouldn't a person dying 40 years early have a tenfold impact on the average compared to someone dying 4 years early. Early being compared to the expectancy calculated without them.

Numbers/source please. 1 middle age or young person dying drops the life expectancy but is obviously just a drop in a bucket.

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