Many scientists speak of a fifth flavor: The UMAMI, discovered in 1980, when Dr. Kikunae Ikeda, managed to isolate Glutamate from Konbu algae, the basis of Japanese cuisine, but was recognized as a flavor in 1980, it also tastes umami inosinate, which It is found in the fish guanilato, its flavor is indeterminate and subtle.

There are no more flavors since scientists have not discovered beyond those 6 flavors, counting the Umami.

Your first reference is about traveling to Venezuela, your second one looks like a restaurant menu.

As for the tongue map, it has been debunked for, well ,decades now.

However, since you used the steemstem tag you opened up your blog to criticism for the potential of curation. As for theoretical, this blog is extremely anecdotal and subjective.