As a father of diabetics I have to say that the article's premise is just plain wrong. As a diabetic (or as anon-sighted person) you have the right to demand reasonable accommodation of people around you. Diabetics needs to know how much carbohydrates there are in a food product they are about to eat to be able to inject themselves with the right amount of insulin to prevent high or low blood sugars (high blood sugars being less dangerous than low). It is reasonable that producers of food that sell their product on the open market supply that information so there is a law for that. It so happens that this law also makes provisions for the declaration of other ingredients as well, benefiting not just the diabetic.
As a non-sighted user you have a similar right to expect, and demand, reasonable accommodation. And again, such accommodation does not just benefit the non-sighted, as has been pointed out in other threads. As is the case with the declaration of content in food, at least in the US, its the law that you have to make reasonable accommodations for the disabled in publicly available software for sale.