That's agglomeration effects, and it disproves the idea on its own. If america is the place where all the talented engineers and scientists go, that is a very very good thing for engineers and scientists in america. Or you are free to go try to be an engineer or scientist in estonia, and see if you make more money due to the lack of competition. (Most top engineering and science talent in estonia leaves for other countries, which by your logic should be amazing for the remaining domestic talent.)
that article looks like full of bs