Earlier quoted context omitted.
That's what the "real" in "median real income" means. It measures how much stuff you can buy, not how much currency you have. And it's been going up relatively reliably: https://fred.stlouisfed.org/series/mepainusa672n
Median is obviously flawed here. What should be looked at is wealth distribution. The rich are getting richer and the poor are getting poorer and anyone with any power is doing their best to accelerate this trend. https://www.federalreserve.gov/releases/z1/dataviz/dfa/distr...
And "the poor are getting poorer" is simply untrue for the last 10 years. They had a pretty bad time from 1980 - 2015, but in the last 10 years, their real income has risen faster than any other quintile: https://www.visualcapitalist.com/growth-in-real-wages-over-t...