Why and how the text could be Bavarian

[Jorge_Stolfi]

But, to be clear: No cipher in the world would encode German double consonants; that would be the key to direct decryption. In a phonetic cipher, there wouldn’t even be a double "t"  

]

Yep. And no one would bother inventing a new alphabet for German, but still use three glyphs to write the /ʃ/ sound.

You are not allowed to view links. Register or Login to view. (not to be confused with steGAnography) is the once-popular-now-defunct art of speed writing, useful for note-taking by students and recording scribes at legal proceedings, parliaments, etc.  For each language there was at least one stenography method, often more than one.  They all started from a basic principle: forget the official spelling rules, encode the sounds phonetically. 

Thus, if Voynichese was developed to make dictation more efficient (as I believe), you can bet that it does not use doubling to indicate the sounds of "doubled consonants" - in German Italian, Latin, etc.

All the best, --stolfi