Indeed, that is an argument in favour of the pseudonymity of the Book.
The question of the pseudonymity of the book is still an open one.
Associated words: pseudonymous, pseudonymity, pseudepigraphous pseudepigraphy.
The "pseudonymity" consists simply in clothing a conjecture with the appearance of indubitable fact.
Mrime's pseudonymity was of short duration, but whilst it lasted it was impenetrable.