Statement: IF Voynichese does not represent natural language...

[nablator]

So this is surely one of the reasons why Voynichese feels like a language.

There is considerable quantitative evidence (shifts and jumps in glyph n-gram statistics, autocopy, LAAFU, PAAFU, entropy increase on the third glyph, etc.) that the text is not what it appears (superficially) to be: written in an unknown but not-too-weird natural language. Also, beside vowel-like glyphs that happen to work well as vowels, it looks like the author(s) put far too much in their creation of what makes a text language-like (repeated words, common glyph patterns and common Gothic abbreviations) to make it as obvious as possible that it is language, nothing but language.

If the VMS is inherently deceptive about the nature of the text, either because it is strongly coded or encrypted (an anachronism in the 15th century), or because it represents something else than language, then everything else prima facie about the VMS (an otherwise unremarkable herbal/astrological/medicinal manuscript) is probably nothing but deception and misdirection too. It would be inconsistent to go through the effort of creating a unbreakable system for the text and then label objects and give precious hints about the subject in illustrations, giving researchers a "low hanging fruit" to attack.