As Russell himself said ,and I paraphrase " If new light should shine upon the Scriptures for us, it will only add to what we understood before, if it replaces what we understood, the latter was not "Light" or "Truth" at all".
It is of course a Prime Example of their taking Scriptures out of context to use the Proverbs one to explain their constant changes of Doctrine ,the context is plain, it is talking about " The Path of the Righteous One" , and obviously, such a man, as he goes through life, will see the right Path more clearly. The light on the Path gets brighter.
To make more of it than that is not just error, it is deliberate wickedness, a Twisting of Scripture.