It appears to me that the "source material" these researchers used is the work of Paul Christopher, Raymond Khoury, or Steve Berry. In fact, nearly everything Loki and franklin have "revealed" in this thread (and others), I have already read about in those author's books years ago - before COI was ever televised...
Of course these authors based a lot of their writing on information contained in the fantasy-rich/factually-short "Holy Blood-Holy Grail" farce from the 1980's.
Of course, there are those that swear that the fictional "Necronomicon" is a "real book", written in the 9th Century, and will even claim to have actually seen or held an authentic copy of a book that ONLY existed as a mention in a 1924 short story by H.P. Lovecraft (it was later mentioned in several other stories, as well as the "Evil Dead" films). The fact remains, however that the "Necronomicon" (even the word) did not exist prior to 1924.