Thank you. The article is using statistics to lie.
A person should not read the study or the article and think, “The reason this is nonsense is X.” Rather the thought should be, “I wonder how the study accounts for X.”
Some studies use household income over years to """prove""" that incomes have either fallen or stagnated. They just outright ignore that the size of the household went from 6+ to about 4. In this scenario a constant household income meant about 50% increase in per Capita income