There's never a final word in medicine. We are always learning newer and better ways to treat. One of the biggest arguments among heart specialists has been the focus on salt. Different people react to salt differently. What this study shows is that if you can tolerate a really low-salt diet, it will help you.
Salt is essential.
But it's a question of what level is enough. And that's where the arguments will continue among heart specialists. People do vary. Some are much more sensitive to salt than others. Use common sense.