Hey I just wanted to say, thank you for sending me down the rabbit hole of both of these texts. Fascinating!

Regarding the Voynich Manuscript, and to be fair to the person you’re responding to, with no current decipherment, there is a good possibility it’s a hoax.

Churchill acknowledges the possibility that the manuscript is either a synthetic forgotten language (as advanced by Friedman), or else a forgery, as the preeminent theory. However, he concludes that, if the manuscript is a genuine creation, mental illness or delusion seems to have affected the author.

Also the Codex Seraphinianus is much newer and self-admittedly describes an imaginary world in an imaginary language.

Anyway, thanks again for the Wikipedia adventure. :D