#18 - March 27, 2013, 1:40 p.m.
There’s a couple reasons we tend not to put certain things like exploits into patch notes. I’ll go into them a bit 
1. We don’t want to highlight a spot where an exploit existed, since people who would have never found the spot then go and try to find a way around our fix, or can glean something from it that inspires them to try similar things elsewhere.
2. In terms of localization of patch note text into different languages, editing, and writing the patch note up, it costs money and time for multiple people. Dedicating resources to explain we closed a particular exploit just isn’t worth the time/resources for every single one, so we’re okay with cutting it from the notes, especially if we have a lot of patch notes that are much more valuable to disseminate out, like Engineer changes and other such things.
We just decided not to put time and energy into a patch note for this particular exploit. Hope that clears things up a bit.
Personally, I don’t consider closing an exploit a “nerf”. I consider it closing a bug that led to player abuse.