Proving my theory wrong would require showing a country that is subject to the same policy, but somehow not supplying educated immigrants. If "Asia" here includes the Indian subcontinent, then I believe the article bolsters my point.
The only other country I'm aware of, that is subject to the same immigration policy is India; while I do not have the stats on hand, my gut is that Indian immigrants have higher than average incomes, are generally more educated, and/or are biased to careers in technology since that industry makes heavy use of one of the more reliable immigration paths remaining to them - the H1-B.
Random immigrants (from anywhere on earth) outperform born-Americans on income and entrepreneurship - regardless of their prior education (you can chalk this to self-selection and/or motivation). Putting in an additional filter on higher education just skews the bias further