Bannon disagrees that we should keep the talented people in the country, but he doesn't want to say it to Trump's face, so he says a bunch of code words for "whites only society."
There's only one way to make a whites only society. It's ethnic cleansing. Trump happens to have already brought discussions of mass deportation to the mainstream.
Mass deportation is a type of ethnic cleansing, by the way. It's right in the definition. There is no leap of logic there.
As an aside, Bannon is significantly overstating the percent of CEOs who are Asian.