Amity learning how Witches are portrayed on Earth.

But wait. The Good Witch Azura is also from Earth. So does that mean the publisher is somehow able to market the book on both Earth and the Boiling Isles? But as far as we know, Eda is the only one who was able to go between Earth and the Boiling Isles. And Owlbert did steal Luz's The Good Witch Azura book. So did Eda sell other copies? Did Amity buy The Good Witch Azura from Eda? Or does this unknown publisher have their own portal?