Actually, whether that theory hold up or not isn't clear, but there's a good chance that it doesn't. AI has even been used to try to examine it, which just created even more questions. The latest theory is that it's partially Turkish. The only thing people mostly agree on is that it has something to do with women's health.
Some of the mystery of the books has to do with it's strange pictures of plants known and unknown and bizarre parts that look animated when you spin the the thing around. You can read it here.https://books.google.com/books?id=8uNBBAAAQBAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
I recently read that some linguistic AI found it follows the same patterns as Yiddish. But nothing translatable. My guess is that it's in a shorthand cypher of some obscure language, and we'd need to delve deeper into its origins to get a better starting point to work from.
Yes. I wrote it in my past life.