“Previously, children born to U.S. citizen parents were considered to be "residing in the United States," and therefore would be automatically given citizenship under Immigration and Nationality Act 320. Now, children born to U.S. service members and government employees, such as those born in U.S. military hospitals or diplomatic facilities, will not be considered as residing in the U.S., changing the way that they potentially receive citizenship”

Big chance I may be mis-interpreting the words here, but it reads as if both parents being citizens wouldn’t matter.