The article claims that both non-severe and severe patients get the same damage, meaning that globally we have at minimum 10 million people with this damage, probably many time more since most cases aren't tested.
But the article does very little to study if these changes actually effect people and for how long.
Evidence, as well as basic observation points to people recovering very well from the disease (we have over 4 million cases in the US but the number of people with crippling long-term effects is minimal, otherwise we'd be able to observe a massive group of impaired individuals).
The article does very little to illustrate that impact on people.
For example, people who lose their sense of smell, which is listed as symptom in this Chinese study get it back and they get it back faster than when they lose the sense of smell with other viruses:
https://www.nationalgeographic.com/science/2020/08/thousands...