Already posted here:
https://gbatemp.net/threads/ninjhax-source-code.378364/
If you had read the article linked, that was just a writeup. Not the source code.
This is the full source code, allowing users to compile their own variants of the Ninjhax saved game, rather than just the pseudocode behind it.
So it basically crashes ninjhax and gives full ARM11 access?