Outliers exist

It’s saying 38 is the maximum lifespan of a human, determined by genetics, and the only reason we can live past 38 is due to unnatural interventions ie medicine

Life expectancy can be affected by things like infant deaths, disease, etc.

lifespan is the age an animal is designed to live for. The study (which was published in Nature btw) implies that humans reaching past 38 is unnatural and only a result of luck and modern technology.

According to the article it’s not about life expectancy, but that the lifespan of 38 is hardcoded into our DNA/Telomeres