my suggestion about the author of MV

[nablator]

What though there are hints about the subject? Everybody knows that you are a medical man and an astrologer. You won't hide that, and you will not, because that's what brings you money. What you'd like to hide are exact pieces of knowledge, so that if your fellow astrologer crushes your skull and steals your book, he is not able to make use of it. You generally won't care about researchers half a millennium since, and (to be honest) even those cannot boast much success up to date

It is better not to have anyone steal your precious book (and crush your skull) because you were careful enough to make it look worthless. A low-quality "ugly duckling" with no recognizable value in its drawings, circles and text to a learned man of the 15th century who would value tradition and ancient knowledge, not originality. Astrology was highly codified, not something that could be done seriously with fake star maps, silly-looking naked women in barrels and tubes. The text is also designed to look silly, with its many repetitions and almost-repetitions.