That's a pretty broad assumption.. Just because he's used therapy from a doctor under investigation for PED's, doesn't mean he's guilty of it. Having played golf at a very high level myself, there is virtually no benefit of HGH or other anabolic steroids. If anything, it would be a hindrance. I highly doubt that Tiger was involved in what would be a violation of the World Doping regulations. Even still, the PGA tour isn't rocking a long list of banned substances.
In other news, that link was really funny. Good stuff for sure.