There are multiple kinds if heart failure but all would have diet and exercise counselling as part of the treatment. Yes, the way someone dies of hypertrophic cardiomyopathy is to block the blood flow out of the heart. It happens suddenly, not gradually. Anything that decreases blood volume can contribute, the most likely here being dehydration. If you know someone who has been told they have hypertrophy not everyone dies of it. There are many milder forms. But when someone does die of it it is usually quite sudden and dramatic - as you can see from game films of sporting events where this has occurred
Are they claiming that no blood could get out of Breitbart’s heart?