I believe that when they say the governing body is spirit directed, it simply means that they (supposedly) base all they say on the bible that was written by inspired men. That's how they can say it is spirit directed. It is also the reason that they make so many errors, because if they interprate something wrong, it just means they are relying more on their own understanding rather than using the bible to decide something.
It would be interesting to ask them if they feel anyone else could be spirit directed!