It's not like AMAI, it doesnt uses any neutral heroes. It's like a nice upgrade of the original. I dont know how good it is against AMAI because you cannt run any other AI when AMAI is on a map.
If you want to see how it plays: use the AI Editor's Test Configuration tab.
If you want to play against or allied with it: open up a melee map, import the file with the following path into it: scripts\undead.ai. This way all undead cpu players will use this AI.
If you are advanced in triggers then you can load it for specific players only.