Agreed. I was surprised that the article didn't mention the Hawaiian Pidgin expression "da kine"[1], which functions similarly to "jawn". Funnily enough, the da kine Wikipedia page makes the same claim regarding uniqueness of expression.
>According to experts, it's unlike any word, in any language.
Some experts. I kept reading looking for a reason why it was substantially different from da kine, and the more I read, the more familiar the description sounded.