The problem is you might be a Windows/Java/ASM/Lisp hacker, and you would be able to understand the general principles, but not the specific (and unfamiliar) source code.
The difference is that i don't know if this is worthy to invest time and effort or not. Does this have an impact on a wide install base of servers? Apparently some HNers can't reproduce this. So it's not worth my time?
I would assume it's just common sense (or courtesy) to put a little bit of text around it. How often do you read a news article about quantum mechanics that is just some lines of advanced math without any explanation at all?