I have not read the whole article so apologies if this is touched on but is "discovered" really the right word here? The foods and molecules that have this flavor were already being consumed long before the term was coined.
(His work actually puts the other four "basic tastes" to shame because where those four are mostly "well studied" in the social sciences [psychology tests of where on the tongue most responded to each of the 4], he actually narrowed down the specific taste receptors for glutamate, and how they operate.)
It's along the same line as "Isaac Newton discovered gravity."
Sort of like India was discovered by Columbus, of course people were living in India before.
Maybe you mean "West Indies"?