All that said, it would be a mistake to rein in U.S. immigration policy. Here’s why.
The largest and most prominent visa category for employment-based immigration to the United States is what’s known as the H-1B visa. Some 90% of H-1B visa recipients are individuals under age 40.7 Typically, economists analyze the effects of immigration through an apples-to-apples comparison of immigrants and nonimmigrants in the same general age and education bracket who are looking for employment. However, peer displacement doesn’t appear in that data set because the salary differences between workers with H-1B visas and domestic employees of similar ages and skills are minimal (in part due to a law requiring companies to pay an H-1B worker the “prevailing wage” for the position).
I don't see how it follows that adjusting the US immigration policy is a "mistake". Isn't the increased supply of workers putting downward price pressure on salaries? Even if H1B requires a prevailing wage, that wage will go down to meet the increased supply of talent that additional developers bring.