One issue that the article overlooks is how many jobs the Microsofts, Googles, Apples, Facebooks, etc. outsource to the H1-B outsourcing companies such as WiPro

One issue that the article overlooks is how many jobs the Microsofts, Googles, Apples, Facebooks, etc. outsource to the H1-B outsourcing companies such as WiPro, Cognizant etc. I have met many consultants in the Silicon Valley who work for Apple through a firm such as WiPro. These contractors salaries presumably would not show up in the salaries for H1-B employees working directly for these large, high-profile companies.