They must accept that Jehovah will [very, very] frequently mislead his people by giving the GB the wrong information or knowledge. (I fixed that omission for you.)
If you come to the perfectly reasonable conclusion that a group of men who have to constantly correct themselves may not be getting their information direct from God... you are an apostate.
Of course, they are not infallible nor inspired and they admitted in writing in the WT rag that they can "make mistakes in doctrine and organizational direction" and at the Annual Meeting they admitted sometimes often "they simply DO NOT KNOW".
Deut 18:20-22
20 But any prophet who falsely claims to speak in my name or who speaks in the name of another god must die.’
21 “But you may wonder, ‘How will we know whether or not a prophecy is from the Lord?’ 22 If the prophet speaks in the Lord’s name but his prediction does not happen or come true, you will know that the Lord did not give that message. That prophet has spoken without my authority and need not be feared.