I am of the understanding that his stance on non human intervention is in relation to terrestrial Non Homo Sapiens. He has stated that although he doesn't entirely discount the notion of extraterrestrial intervention, he feels that it is highly unlikely.
I may be wrong, but that's my take on it .
I personally consider all possibilities, However I also consider extraterrestrial intervention the least likely.
On hieroglyphs, and also forgery issues aside, for me, the only markings in the GP that are cast iron guaranteed to be contemporaneous with at least part of the construction are those recently discovered and that lie behind the QC air shaft door.
Post Edited (16-Jun-15 12:38)