After posting Google v China I realized this is a showdown like no other. In my experience, no one "ejects" the advanced persistent threat. If you think they are gone, it's either 1) because they decided to leave or 2) you can't find them.
Now we hear Google is the latest victim. Google is supposed to be a place where IT is so awesome and employees so smart that servers basically run themselves, and Google's HR has to leave some of the other smart people "in place" to help the rest of us cope with life. Could Google be the first company to remove APT despite APT desire to remain persistent? Google v China could be Mechagodzilla v Godzilla. No one without inside knowledge will know how this battle concludes, and it probably will not conclude until one of the combatants is gone.