> The Credit Suisse employees that lost $5 billion due to Archegos were overpaid.

Edge cases. Most people work for businesses that make a profit, and those businesses' profit comes from the difference between the value its employees create and the salary it pays to them (at least in aggregate).

> Finally, for some professional jobs productivity is hard to measure, yet you may employ many people because in aggregate they make a profit. At an individual level, the profit margin can vary from negative to positive.

You're confusing what is meant by the "value of your labor". Of course what GP meant is "the value of your labor as seen by your employer". If everyone could create the same value they create in an organized business while working solo then nobody would work a job as it would just be losing money.