They don't make anyone's list of the top cancer centers in the US, (except their own). If they spent as much money on patients, staff and equipment as they do on advertising, they might get better ratings. Marketing to the largest disease / patient group in the US, cancer, is big business. And these guys are all about the $, regardless of the feel good ads they run.
I agree that nutrition is part of the process. Once you are diagnosed it alters healing rates if not managed properly. Your body needs the right stuff in the right amounts to repair itself from the treatment damage. But what America needs most to get is that poor nutrition is part of our national problem - raging from obesity, diabetes, heart problems, and more. As part of any curative process it isn't part of the equation.
Please note that I did not comment on the mind body connections which we are understanding more of each day. I stayed away from this, as some want to jump right to mind over matter. Which is to say we are a long way away from controlling any body process related to cure via mental states. Positive attitudes have many cascading positive impacts in your cancer process, and in life in general, but cure isn't one of them.