How authentic is the information channeled by Walter Russell in his books, “The Secret of Light”, and the two volume series, “Message of the Divine Iliad”?

He is a valid chronicler of the cosmos and the divine truths in the operation of the universe. Coming from a prior era, his questions lacked some sophistication and the precision of a greater scientific awareness would have afforded him, but this was not yet in place in the culture he inhabited. But he did quite well, as you have seen, in perceiving and recognizing much wisdom in the mathematics of the universe, as he had a mathematical inclination that served to bring much of that underlying mechanistic organization forward into awareness. So he did contribute accurate and important knowledge. There were a few inaccuracies along the way, but this is to be expected as no one is perfect in all they do.