Further, it is widely reported that google go to some efforts to squeeze as much work as they possibly can out of the computers that they do have, which is the real point of background to this article.
So it certainly appears that they do not have spare computing resources.. is that the same as "not many computers" - It's hard to say. Many is a relative term:
I do have many computers at home - 7 or 8.
Google doesn't have many computers in their data centers - less than 10 million.