It makes perfect sense, especially to a linguist like me. If you actually read the article and understood what it was trying to say, rather than use it to create the false impression that anyone at all thinks there are 81 different genders, then you ought to know that. The author is quite clear about this, so I don't know how you missed it. Most of the article is about gender classifications in individual foreign languages and cultures, not English or the culture in which this thread is embedded. It has nothing at all to do with pronouns. The object is just to show that, throughout history, human beings have constructed different ways to refer to gender, most of which do not conform to English usage. I suggest that we not stray off topic, although the article is an interesting result from research done by one education professor.