[EdHominem]

Not really. I'd expect more workers from a company to be foreign than the management.

Most jobs are somewhat standardized. You can essentially follow instructions. Management, for all the donut eating they do, is less standardized and much more shmoozing based. Much harder to do with even a small language barrier. And old-boys-club or not, you'd expect locals to have more alumni and other attachments which could be useful.

Not all things that result in racial differences are racist.