Basically it outlines a way to bypass APIs hooked with simple jmps which is the most basic/common userland hooking method. GG uses mCH for hooking APIs so their hooking methods aren't limited to just jump hooks.
Most of the cheating is done through injected dlls which reside in the process space of the executable and thus bypassing hooked APIs is only a concern when you're trying to make modifications from an external process.
Your link's messed up by the way; I'm guessing that the russian domain in question is for some reason blacklisted by ePVP forums.
