Why should it not work anymore? If you want you can use it, I just don't know what the official source is with the latest updates, but it will not help with the aiPlayer peek value, it is just ragdolls. However it is part of the GMK kit, which meant game mechanics kit, which adds a lot of game mechanics you need for making a game, like cutscenes, scripted events and some ai features.
So before you bother creating any new feature, you should search through all the resources, since in many cases someone already programmed such a feature.