You seem to mistake having a salary for having money.
America now has more than 6,000 Zoomer chief executives and 1,000 Zoomer politicians.
Also, what if you're not a CEO or a politician? Also, plus, too, how on earth is "small town city councilman" or "part-time New Hampshire legislator" a sign of wealth?
I don't get the point you're trying to make with your graph. Obviously there wouldn't be many Zoomers working full time; most are still in school.
Zoomers born after 2006 haven't graduated high-school, and those born between 2002-2006 are in college. That's leaves only a 5 year window of people you'd expect to be employed full time.
The line for millenials looks about the same as Zoomers.
I can't read the entire article since it's behind a pay wall for me, but graph alone doesn't support or contradict the headline. It simply shows the full time employment of Zoomers is comparable millenials at when they were the same age. It doesn't show anything about income.
That was one single indicator. I agree it's not the best, to your point, unemployment, homeownership, and salary averages are the ones that show middle class wealth.