You present information in here that is worrisome such as a picture of a tongue with different taste zones (your tongue isn't broken up into zones like that)
There are also way more fundamental tastes then just sweet, bitter, salty, and sour (acid, btw acid isn't a taste and not all acids taste the same, some taste hot and some taste sour)
Excuse me, but the tongue, as we know, has areas where it can better capture the flavors of the food that it touches. There are no more flavors since scientists have not discovered beyond those 6 flavors, counting the Umami. This topic can be observed in primary and secondary books respectively.
Also, the topic that is being looked at in this blog is about taste in a theoretical way, not the tongue itself. If you need to make an abusive comment, I recommend reading the blog first.
However, thank you for taking your time to comment, even if it is a comment I did not expect at all. Have a nice day.
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.