Well, it kind of seems to me that irrespective of the dubious authenticity of book and shiny new map, it seems to have eluded anyone in newsrooms to point out that the people who would become the native American tribes had already located it some time before. Five minutes with the Internet would have gotten a list of claims about subsequent discoveries ranging from the preposterious (Ancient Egypt) to the more credible (short-lived Viking colonies).
One might also note that the Chinese penchant for claiming to have invented and discovered everything sounds not dissimilar to the old Soviet Union or the US, if a little more backed by evidence.
(Besides, what’s the point of discovering something if you don’t do anything useful with it? There’s a reason that New Zealand was a British, rather than Dutch, colony; similarly, it’s all very well to note that the Vikings, or Chinese, or whoever, were the first bunch to happen on the Americas in modern history, but they didn’t do much with it, did they?)