I detest it when some so-called scientific org makes such a statement as in the OP. There is absolutely no way to determine whether that group of people died as a result of salt usage (unless they drowned in it). Hypertension can and does happen to those on salt free and low salt diets. In fact, I'd be willing to bet that a large percentage of those who died this way were on salt free/low salt diets before they died.
Long life isn't desirable if you're miserable for the length of it. Want to live a good life? Eat what makes you happy.