I don't think that her being overweight is an issue. As a fat person myself, I know loads and loads about diet and nutrition, but it doesn't mean that I can apply it to my own life. It's a common thing, we know what we should do, have no problem telling others how to do it, but we just can't do it ourselves!
The diet works, and has worked for plenty of people. It's not like she is actually advertising the product. They have "real life" people, who have lost weight on the plan, advertise it. As for the "dangers", there is plenty written to support the diet, and similar VCLD's. x