Earlier quoted context omitted.
I guess it shows how far we’ve come, as that income would have been considered rich in 1900!
$20,000 in 1900 is worth $619,971.43 today, so not sure what your argument is. It's not the raw number value that matters but what people can buy with it.
While "rich" is over stating it, based on purely inflationary measures $20k in 2020 (or $645 in 1900) was not bad pay.