To me, it seems like either a username or a business name, not a description of a role. It's a separate party from AM, RM and Havelock. If it was just a person in control of the hash rate, that person would probably be an AM employee, not a separate party. It makes far more sense to me that HashLord is in the business of hosting miners.
then the quote should look more like this, but that's just my take on it.
AMHash theoretically involves 5 Parties (Rockminer, Asicminer, HashLord, havelock, Private Investors)