Well Jim says its canon. So we actually have WOJ that the Dresden Files RPG is essentially canon, and so the Paranet Papers fall under that umbrella. Like all the associated Dresden Files works, there is some misinformation and half-truths, mostly on account that Jim has more books to sell and doesn't want to ruin the whole thing.
As for words of an Archangel being truth - WOJ is that Uriel whispering seven words to Dresden was truth on a cosmic level at the end of Ghost Story. We also know that they have Intellectus which is defined as having all of reality present to the being with Intellectus, they merely have to ask the question to know the answer. They don't seek knowledge as such. But cause and effect are tricky for them because of that, because Time isn't linear for them either. So yeah Uriel may be somewhat changed by human belief in each universe he appears in, but the being that exists everywhere that is called Uriel in the Dresden Files universe is absolute. The WOJ is that it is NOT the beings themselves that change, but OUR understanding of who and what they are.
Kbrizzle - I agree with your theory mostly. I 100% agree that the Vampires Courts creation were multiple attempts at something, and I would bet that Drakul is behind it all (I even think I posted a theory on this a while back...). I must admit when I wrote my post I was half-asleep so that sentence on the end doesn't make sense, and I cannot remember really what I was meaning to say. I think if each Court of Vampires has a sort of LoON type group (Lord and Ladies of the Houses in White Court, Elders in the Black Court, probably something similar in Jade) then I agree it stands to reason the Lord Raith is likely NOT to be the progenitor. It would be interesting to find out what happened to the original White King (can someone ask Jim at the next con or whatever?)
Dspringer1 - what is the WOJ you are referring to?