Yes it is, by one simple metric.
An ounce of Gold was 41-45 dollars an ounce in 1973.
Today Gold is setting all time highs at 3400 dollars an ounce. Top earns went from an ounce of gold an hour to an ounce of gold every two and a half weeks.
Wages, adjusted for inflation and including housing, are higher than they've ever been. This includes the bottom 10th percentile, which are up by 40% since 1973.
They're still too low. But "Americans are poorer than they used to be" is simply not true.