I assume the book has a lot better sourcing and footnotes than this excerpt has, because the excerpt has none of either. The only part of this article you need

I assume the book has a lot better sourcing and footnotes than this excerpt has, because the excerpt has none of either. The only part of this article you need to read is "It’s not clear what the NSA and Google built after the China hack. But [thousands of words of speculation and innuendo follow]" It's not clear, as in the author doesn't know.