The comment suggested people who still lived overseas. The foreign born talent you work with lives in the US now. If anything it suggests the best talent moves to the US for the better salary and quality of life.
My company has significant teams in many countries. Daily I work with people from all over the world. I've certainly worked with some excellent people who worked in China and in India and had never set foot in the US. But you are right, the majority of the people I work most closely with are in the US and so I know their characteristics the best.
