That's not true. The only thing there is is a comment (to non code savvy folk out there, that means a bit of code that is not processed, where the codewriter says what he wants his code to do or explains why it works) saying "special case exists here in code for forcing aggression on player if at peace with everyone for N turns", but that's it, there's no actual code for this. Just the comment to tell people "if you want to do this, here is where you'd put the relevant code".
Oh? I understood the comment to mean 'for the information of those modding this file, the code that handles AI logic does this', rather than how you interpret it. But you probably have followed the AI modding discussion more closely than I.