One article author says the idea behind GFT has merit:

I think, actually, the core idea is a terrific one.

From [1]. [1] also has professor and doctor state that her models improved after adding GFT data. Data from search behavior does not have to replace CDC data. It can improve it. No myth.

[1] http://www.npr.org/blogs/health/2014/03/13/289802934/googles...