I actually thought it was weird OP mentioned those things, even when they are exactly prime example of the people the article and many of us are talking about.
You see them, for example, at College/University (in my country, at least): They are single and have to keep their parents so they have to work at the same time as they study; or they have families so they have to go to night/weekends school and they manage to overachieve and graduate while working and having that family; I have a friend with short arms, like a T-rex, and he works right next to me (he sets up his own environment so it’s more ergonomic for him), and he goes to parties, drinks, plays soccer with us and he has a family.
My own experiences are not that... how to say it, bold, but I have my fair share of setbacks, but when you see these people, and while they are not the majority, at least here in my country you see a lot of them. Some of us suffer health or family problems, but at some point you realize that's life and simply try to tackle such issues however you can while keeping sanity. The first examples I mentioned... I don’t know how they do it, but I guess that’s what the article is trying to say.