It's pretty common in Europe for people to get a socially-funded education then go off to the USA. It's called brain drain and has been happening for a while, not sure why this guy needs to write an article pretending that's not what's happening here.
Moving to the US from Europe isn't that easy. I only made the move because my wife is a postdoc over here, but with things like H1-B freezes and covid-19 it can be very difficult to do.
Green cards, L-1, O-1 and spouse visas are the way to go.
Getting an O-1 visa in the software space is a lot easier than you think, especially with the way the software industry works in Europe (it's a much smaller pool with a higher average level of education and way more public speaking & publishing opportunities) in general the requirements are easier than if I were to have to try for it.