The truth is, about 25% of new businesses in the US are started by first-generation immigrants. 30% of new business owners only have a high-school education. Here are a few more stats: https://www.smallbizgenius.net/by-the-numbers/entrepreneur-s...
I'm not sure your source is exemplary in citing cast-iron statistics - the article you cite includes a lot of referenced and very varied sources (some of them seem to be just news articles), but few concrete references to back-up their purported numbers.
> The truth is, about 25% of new businesses in the US are started by first-generation immigrants
And this assertion doesn't contradict the article unless we're supposed to assume that being a "first-generation immigrant" automatically means you are poor and without any family resources.
I also had relatively wealthy parents which enabled me to save up to move/emmigrate.
Emmigrating to a wealthy country is crazy expensive. Plane flights, rent/down payment etc
Which all boils down how massive of an advantage being wealthy is/middle class is even if that wealth is peanuts by US standards
So for me it seems like going to US makes you small outlier, the programming people that I know and went to US were really strong devs