I assume he meant to decry the use of inflation adjusting and similar shenanigans to be able to compare two groups in vastly different ages. It is similar to saying that a peasant in today's world eats/lives better then a king a thousand years ago.
For instance if you use percentage of world wealth as ameasure, then Adam controlled 50% of the world's wealth, arguably the richest person to ever live (or mythologically live at least).