My understanding of the issue is that different cancers are different. Sometimes radically different. Certain specific types of cancers have been shown to react well to ketosis. Others have been shown to be indifferent to it.

I agree that the current state of the medical science on what humans eat and how does it affect them is an incredible mess. Try Ioannidis for starters, or a popular article about basically the same thing.

At this point my prior about medical news in the press (e.g. Google News) is that it's wrong and my prior about most papers on PubMed and such is that they claim far more than they can prove. There are massive biases all around together with money (and government) exerting an active influence on what people should believe.