What a load of crap (we all know it's based on a false premise)... but a very smart move on their part.
It has obviously got back to them that many, many people are having a tough time with this overlapping generation teaching. And as we know most jw's don't care if they can't fully understand or explain something themselves - they just feel safe knowing that there IS an explanation for it and that if need be they can refer people to it.
Ask any jw about how 1914 came about and 95% will not be able to explain it. But they do know that there is some sort of explanation in the back of the bible teach book somewhere and will direct you there. In their minds it's "problem averted, now let's get back to more superficial jw stuff, you think too much."
I wish this would be something that would wake a lot up, but instead I can't help but think that this is going to pacify a lot of the still-ins with doubts. And if someone questions the overlapping nonsense from now on, the elders can proudly say "that was fully covered and clarified by the GB in the September broadcast."