I think it is pretty obvious they mean that the pipeline of candidates for US work visas reflects the established societal privilege patterns.

I think the question is how much it (H1B) costs vs the person's disposable income, in addition to the cost of spending time pursuing it, having a place to do the paperwork, having a stable address and even a stable identity... I'm saying the people who make it to that embassy with the right paperwork are already highly filtered.