Interesting proposal. Long and studied. Parts may be correct but others lack context and more than anything lack of evidence of human contact. I can imagine the Asia parts but it is very hard to believe the Central America and the Caribbean parts, by then those places were fully inhabited by hundreds of thousands of people, hard to miss such an encounter. The author at parts seems like trying to force himself into his theory. The push to probe the China supremacy by the 300th page is tiresome.