Benny - Please be aware that the ironically named 'scholar' is a JW apologist with a very shallow grasp of his/her topic.
Carl Johnson's book is exhaustive on this topic but I don't know how you would get a copy. Do check out the articles at JWFacts website and see the links to previous threads on this topic.
Suffice to say from the outset that there is literally NO scholarly support for 607. It is not even a debate in academia. It is based on a clumsy interpretation of scripture. It is beyond reasonable doubt that at least some of the GB are aware of their error in this regard.