The article is saying that life expectancy is still improving in Europe, but it's improving at a slower pace than it used to improve in the past. In the United States, life expectancy started diverging from Western Europe in the early 90s and has had zero improvement in the last 15 years while Western Europe has continued to slowly improve.

The pandemic hit US life expectancy figures incredibly hard due to the very high levels of excess death compared to Western Europe, but presumably there might be a 'bounceback' due to natural selection of the aged population with the strongest immune systems and fewest comorbidities.

I've heard a lot of Americans comment on putting on a lot of weight while travelling in Europe. I can only imagine that Americans would be more accustomed to eating out for more of their meals. When cooking at home, I found the French to have a good sense of portion sizing and a cultural aversion to overeating; the sensation of being completely full was often described with a sense of discomfort and disgust. Whereas in Anglo cultures, being completely full is treated more positively.