I don’t think that’s really a fair summary of the article and it elides many of the nuances, such as the fact that the “increase in wealth” you cherry-pick is due to demographic changes (workers getting older and thus having higher salaries) whereas the other measures in the article all point to declines. But more to the point: does this summary reflect your actual experience?

The word that caught my attention was demise. It doesn’t square if you believe that the US is seeing record employment and record stock market returns, as more than 50% of US households have stock-based investments.

I was asking, and still hoping to see, the metrics and data that point to demise of the US middle class.