It's studied, of course, but, yes.

Even if 10 % of patients end up with permanently reduced lung function it's a lot because the disease is so infectious, given the right conditions, and it isn't going anywhere soon, at least not this winter.

Here's an overview: https://www.nature.com/articles/d41586-020-02598-6

I think you have misread the article. It says that less than 10% will even have intermediate-term damage. There is no evidence that any significant numbers of people will have long-term, let alone permanent, damage.