This is kind of silly. Basically it’s just saying that stocks have rallied this year. US stocks are up ~14% YTD, and international stocks are up ~5% YTD.
So the more you had invested, the more “dollars” you made this year.
Last year was net down, so it makes complete sense that people with more money lost more “dollars” last year.
Young savers have done especially well. Gen Z saw a 66% increase in average 401(k) balances compared to a year ago, while millennials saw a 24.5% increase. Average Gen X balances were up 14.5%, and baby boomers saw an average increase of 6.3% compared to a year ago.