They create confusion too, I think, by claiming The Watchtower is just one magazine, both editions are The Watchtower and are semi-monthly, but... they only include the printing figure for each issue of the public edition. In actuality they are printing over 60 million copies of The Watchtower each month.
Why do they only give the circulation figure for the public edition?
I imagine the simplified edition and braille editions are the same as the study edition, 15th of the month issues. (fit in as such, same with the large print editions).