As for any questions on this point, you'll have to ask David Splane directly. No one else knows. It's amazing how he got this past the majority of the GB at the meeting(s) where they discussed it. It's evidence of how desperate they are to "deal with" this passage in Matthew.
Perhaps in the end someone on the GB just said, to use blondie's point, "Well, it doesn't really matter whether they understand it or not. They are so loyal that they'll just believe whatever they are told to believe."