The article mentions overdoses. They don't explain the difference.
> To some extent, we know what is killing the young, with an actuarial analysis of government data showing mortality increases in liver, kidney and cardiovascular diseases, and diabetes. Drug overdoses also soared nationwide, but not primarily in the young working class.
The article claims that but I can't tell what evidence they have for that claim. One of their linked pdfs[0] is long but as far as I can tell involves working class insured folks, and the chart on p31 shows Drug Overdoses as the largest excess category by far for the 0-44 age group.. Also page 27 says "Note that recent period deaths may continue to shift from non-COVID to COVID as COD coding becomes more complete".
Edit: and the table on p43 seems to directly contradict their claim that the excess deaths are concentrated among the young "working" as opposed to non-working: Age 15-44 have almost the same percentages (18.9% vs 19.2%) for excess Q2 deaths; the insured cohort is the slightly lower one. "It's probably mostly drug overdoses and COVID" still seems like a reasonable null hypothesis to me.
> To some extent, we know what is killing the young, with an actuarial analysis of government data showing mortality increases in liver, kidney and cardiovascular diseases, and diabetes. Drug overdoses also soared nationwide, but not primarily in the young working class.