I don't think that a smart person suddenly starts to fear AI risk because they read in a newspaper that Steven Hawking is afraid of it.
Well, Steven Hawking is far smarter than most people, so on most subjects which Steven Hawking is familiar it would be a good idea to update in the same direction as him, unless you are an expert on it too.
Also, it raises AI risk as a possible concern, at which point people might then try to find more information, such as Bostrom's book, or website.
So yes, people get more information from reading a book than reading a newspaper article, but the article might be what lead them to read the book in the first place.
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