Yes, I, It sounds crazy, so why do it?
Salt removes the bitter taste of the coffee, making the coffee more round and soft in taste - without the extra calories you get from sugar and / or milk.
But now the wine and spirits vinepair has made it for you, apparently in earnest. And i suggests that you do it too.
Even people who drink that variety should consider some salt in the coffee, as the bitter taste can often become too much and overdo the coffee flavor. In fact, several coffee experts believe that the bitter taste is one.
But I would not recommend it if you drink good quality coffee or if you like the coffee for its bitterness.
Bitter coffee can be caused by a few different things — the water is too hot, the machine isn't completely clean, the beans are no good or the coffee's been sitting too long on a hot plate.