It's impressive in the sense that the staff size is in the order of magnitude you would expect given their publicly-visible product. Many companies will brag about their ops staff being big (because they're so great that their system has to scale) or small (because they're so great at building scalable systems), but operate so opaquely you have zero way to judge the impressiveness of the number and you have to trust the opinion of a journalist that doesn't even care to know.
http://news.dieweltistgarnichtso.net/interviews/moot-4chan.h...
Second, you appear to be confusing Fundamentals of Engineering exams and Principles of Engineering exams. There is no Fundamentals of Engineering exam for any engineering discipline, including structural, electrical, etc. Only the PE exam focuses on individual disciplines. FE is for...fundamentals.
Finally, and ironically, they do in fact make a Principles of Engineering certification exam for software engineers[1]. It's been offered for almost 5 years now. As of last year, the majority of states offered the exam and license software engineers just as they do other engineering candidates.
1. http://ncees.org/about-ncees/news/ncees-introduces-pe-exam-f...
It's mainly useful if you work for a consulting company.