They enjoy the lifestyle that an international experience affords. Many had their children in the international school system which is a US prep school equivalent education. Students on those campuses worldwide receive early solicitation and consideration at the top US universities who visit their campuses on a regular basis.
There is a certain uniqueness living as a "guest" in another country at the level of these executives. No this is not guest worker status to say the least. There is an automatic entree into social circles that might not be as easily accessed by country natives. I know I have done it. Of course there is also the exclusive circle of expat communities where people from many countries, cultures and multi-national companies meet, build, and forge ties.
The article aptly points out the ever widening chasm between a global elite group of professionals and the local business populations. However I would posit that are all country economies become more integrated into the global whole and salaries equalize worldwide, many more so-called local or regional professionals will be competing globally work and be willing to live where the opportunities are.
If you are over 50 and reading this, you may find it hard to grasp, but educated professionals everywhere under 30 just get it.