Where are the corrections for population growth? I think the OP's claim might be true, but their case is not watertight.
A quote: "The real issue is manufacturing employment, which is dropping like a stone. And the reason for the drop is an increase in productivity." ...Really? Maybe it's only part of the reason? Macroeconomic phenomena are complex. 538 should be better than this! Give me nuanced analysis, with intellectually-honest qualifiers.