In esence, it is a third party program. But Gravity long told the players that anything that fabricated an Homunculus AI was perfectly permited. This allowed players to have "legal botting" also known as "homun farming", which was basically construct an AI so that an homunculus would kill anything on sight while the creator kept leveling up and sometimes keeping the items dropped as well.
At any rate, since this is a PK server, it can't bring any harm to us. If any creator starts to farm with their homunculus, you just simply kill both.
In the end, it could be actually interesting to see some creators come up with nicely done AIs that really come in handy in battle.