[FredPret]

Your linked article looks at PPP income.

Here are two that compare wealth, showing the US 50th percentilers doing significantly better than European ones. US median wealth according to this is $162k: https://www.richmondfed.org/publications/research/economic_b....

And it's hard to get this data for Europe but looking at the "Median" column for this https://en.wikipedia.org/wiki/Wealth_distribution_in_Europe it looks like the US middle class would slot into fourth place, just below Denmark which is at 165k, and far ahead of say, Germany, which is at 65k.