Steve Jobs was not a life-long fruitarian. He dabbled in all sorts of different diets. According to Walter Isaacson’s biography he seems to have generally lived as a pescatarian. Interestingly enough that diet is considered one of the healthier ones.
Obviously Steve Jobs should not have delayed his surgery. I understand that people are angry that a man with his means was still able to get a transplant and all the medical care that is unavailable for the rest of us. I understand. However to assume that his disease (and death) was the result of a diet choice when there is no credible evidence for it seems rather absurd.