I don't believe this.
Maybe it is, maybe it isn't.
I didn't see the results of any radiocarbon dating in the article. There was no reference to a journal article or published report. In fact the article was short on a lot of the technical detail I would like to see.
I think I'll wait before agreeing that this site is the "most important archaeological site in the United States."
I would choose Meadowcroft or Topper as the most important site...until I know more about this site.
You are right, and your profile shows you know what you are talking about. A book makes no sense if more than half the pages are missing......