You are not supposed worry about the mapping. You trust the website to help decode it. You just remember the sentence. It's a little like what3words for coordin

You are not supposed worry about the mapping. You trust the website to help decode it. You just remember the sentence. It's a little like what3words for coordinates. The rationale being you are more likely to remember grammatical cogent sentence, than a random string of alphanumeric characters. Although I will agree that the generated sentences don't seem easy to remember. So I doubt it's utility.