It's easy to fill seats.
The question is whether we have "good enough" software engineers. And, as long as we're trying to improve as a company, we'll always want better engineers.
In any case, there's reason to believe many of educated immigrants will become entrepreneurs and create jobs themselves.
Personally, I think anyone with a 4 year degree should be allowed to get a green card if they can show they have the $$ to live in the US for a year and agree to look for work. Because the way it works now, even if the article is bullshit, it is comically vulnerable to arbitrage [LOL yes, why we do indeed need a 'junior web developer' that knows C so he can understand how our api works...oh, well, we realized after he arrived we needed him to work on this C project that was critical to our infrastructure and is responsible for 100k+/day in revenue while we pay him half of that of the guy that quit] if you can pay a lawyer for an hour.
Just my two cents.
Wow, so the author thinks you only have to interview 1 person for each job. That's a Polyanna view; reject that statistic and the entire article falls apart.