Isn't making code ineligible to outsiders an essential requirement for job security? And how much sense does it make to you? What can you tell about this code

Isn't making code ineligible to outsiders an essential requirement for job security? And how much sense does it make to you? What can you tell about this code except for "it's written like APL?" Can you tell what it does? How it does that? What all those one letter functions/macros mean? No, you can't tell shit.