It's simplistic because of the format. Its intention is to explain the general line of reasoning to the person who asked for it, not provide an exhaustive analysis.
The article you've cited addresses immigration in general, not low-skill immigration by itself. This could support argument in favor of a selective immigration policy, not massive immigration of low-skill workers from developing countries.
The article you've cited addresses immigration in general, not low-skill immigration by itself. This could support argument in favor of a selective immigration policy, not massive immigration of low-skill workers from developing countries.