Spain has a similar prevalence, but far higher mortality. UK, France, Italy have comparable mortality, but also significantly lower mortality.
However you pick the numbers, there are ways to make the US look better or worse.
Which numbers[0]; spain only is a bit above (6%) in deaths and below (28%) in prevalence.
Belgium is far higher in deaths; there is an actual significant difference (26%) there, but not many people live there ofcourse.
Outside the UK (is that still the EU), most countries are a quite far below the US in covid mortality.
That tells me that when controlled for prevalence, the US actually deals far better with COVID than Europe - most likely because fewer old people got infected. Also, a lot of people died early in the pandemic, when there weren't so many tests.
I wouldn't say the article itself is bad, it shows you that the difference between EU countries is enormous (Figure 1).