The idea seems to be that overprotective parenting of children isn't harmful if those children continue to live with their parents as they enter adulthood, since their parents will be able to help them as they adjust. (Supposedly this happens in Italy.)
Likewise, having children move out when they become adults isn't harmful if those children have grown up with the ability to live independently. (Supposedly this happens in Germany.)
The problem comes when you combine overprotective parenting with the norm that children should move out at a relatively young age. This leaves young adults both unprepared and on their own when they leave. (Supposedly this happens in the US.)
I lived in Italy for a while and yes this does happen. Kids often continue to live with their parents well into their 30s. But this is mostly due to a shortage of new housing.
That just seems really awkward. By their 30s people are often having kids of their own! Does italy have something like love hotels for teens and young adults who don't want to make out with their parents in the next room?
The article probably refers to Italy as one country where it's commonplace, meaning the progress into adulthood includes gaining your independence while staying in the familial house.
Although I’m slightly confused by the quote. How do kids in Italy get started navigating real life earlier if they live at home longer? I’m guessing the point there is that they have help in early adulthood while still living at home, but the quote, as written, is a little confusing.