No, according to Mark J. Perry and FEE the percentage of households that are low income is smaller than ever, not the US Census data. This article cherry picked $35,000 as the middle to lower class threshold for a reason.

The Brookings Institute, "Our definition is a relative one, meaning that the thresholds pictured above will shift as the income distribution changes shape. If income rises across the distribution, so too will the thresholds that delimit middle-class incomes."

Long-running non-biased standard measures of middle-class do not agree with this article's definition of where the middle-class starts and ends:

https://www.pewsocialtrends.org/2015/12/09/the-american-midd...

https://www.brookings.edu/who-are-the-middle-class/