The article does talk about why labor overseas is cheaper. Twice, in fact:

Labor costs in countries where the government pays for health care are often far lower than anywhere in the United States, particularly in California.

One budget document viewed by The New York Times showed the cost of a seven-person set operations team — positions known as “grips” — to be roughly $59,000 for a 30-day shoot in Budapest.

Because of health care, pension and other expenses, it costs about $53,000 to employ just one senior-level grip in Los Angeles for the same time frame,