Spoofing search engines has been a common activity since the early days of the web. I'm sure the clever folks at Google wil find a way to filter this stuff out.
Yes, Google and others can select sites. It is the larger priciple at hand that I find significant - even more sophisticated forms of noise can overload the searches at some point.
Today Google could content check for consistency too. But the scripts that generated the web noise can also become undetectably similar to say, a Sentor's speech or a book review.