So basicaly they are saying they agree with A H Macmillan, and so they will keep looking into the bible for more dates like Macmillan did.
Also about admitting to mistakes I think Macmillan meant when you have no choice you admitt your mistakes, but don't admit to mistakes if you still have wiggle room. And so if they have wiggle room the GB will not admit those mistakes only the ones they have no wiggle room and then it will be done in such a matter that while admitting to a mistake they will be patting themselves on the back for staying in expectation of the end and sending JWs to the doors to warn people to stay in expectation, wrong dates canceled out by good motives of expectation, no harm no foul. Everything is square with Jehovah who hates it when people don't stay awake and keep in expectation of his great slaughter, no charge can stick as long as they keep preaching and never give up no matter how many dates come and go.