my suggestion about the author of MV

[nablator]

Are there significant facts to believe that the author lived in the 15th century and did not use drawings from books in 16th (clothing)?

I'd say there are no significant grounds to believe the contrary. That's what the Ockham's razor is about: "frustra fit per plura quod potest fieri per pauciora".

If one presents such grounds by unveiling some new facts in confirmation or, perhaps, by revealing that the "15th c theory" has some inherent contradictions, then, of course, that would be quite a different thing.

There is considerable quantitative evidence (shifts and jumps in glyph n-gram statistics, autocopy, LAAFU, PAAFU, entropy, ...) that the text is not what it appears (superficially) to be: written in an unknown but not-too-weird natural 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) including its apparent age 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.