The $10m is not calculated based on economic value. As explained in the article, it’s calculated based on extrapolating how much we will pay in order to avoid some small risk, then dividing that by the fractional risk. So if we will pay $1k to avoid a one in 10,000 risk of dying then a life is worth $10m. Economic value doesn’t come into it.

If you’re interested US GDP is $22tn, with a work force of 164m people. That gives an economic product of about $134k per person per year on average. That includes unemployed people though, because it’s the labour force size not the number of people in employment.