Napoleon III and Empress Eugénie's 1859 telegram code reportedly cracked with AI

A user says they used Astra and some Opus 5.5 to break the private telegraph code Napoleon III and Empress Eugénie used in June 1859. In the user's reconstructions of June 23 telegrams, Eugénie says their son is doing well, while Napoleon expresses concern about his health and asks for a frank update. The user says the telegrams have been held by the Bibliothèque nationale since 1916, with no published key or, as far as they could find, published decodings.