This makes complete sense to me: I've always thought that the reason canned foods contain so much sodium is that our tastebuds can't detect that salt in the same way as it can when it's sprinkled on top, or when it's added closer to the finished product.
I had always guessed that this was because the salt is detectable when our tastebuds can find a pocket of it in suspension, where in canned foods it's not only evenly distributed, it's very finely dispersed. Two possibilities: one, that our tastebuds can only detect molecules of a certain size, two, as the article mentioned, that our tastebuds are more inclined to detect variations in flavor than actual flavors.
Very interesting, thanks for the link!