I had never heard of this story before, and it took me a while to get my head around this bizarre and complicated sequence of events.
But I don't understand the angle being put forward here. So Cassini says Diana Vaughan did actually exist and her revelations were actually true? Then why didn't she show up at that meeting? Wouldn't she know that by not showing up, she was discrediting everything she had said? And if she had been murdered beforehand, as it seems is suggested, why wouldn't Taxil say that at the meeting?
But mainly I don't understand why Taxil's writings can be considered true when he himself said publicly that he made all that stuff up?!
In other words, if you don't accept the main events of this story as true, then what exactly do you think happened?