Generally about proposed solutions

[Stefan Wirtz_2]

[..]This codex was not made by aliens but by men with a very different mentality than ours, and its study requires the mastery of many subjects.
[..]

VMS is a written Bermuda triangle of unknown letters in unknown words of an unknown language.
Without knowing at least one of them, no one will get the other two.

The cited sentence is somehow funny, as it could be the complete opposite also (as often in VMS).

If this is really written be deep mastered men:
where are the men's themes?

We all can see the uncoded Visuals of VMS:
a collection of plants with rather short texts (foreseeable about gardening),
some longer texts,
kind of calendars and weather things,
roundels with categories,
some horoscope stuff,
easy bathing,
herbs with 1-word-comments and very short texts,
the Map I see totally different meanwhile (nearly nothing occult or metaphysical at all)
and maybe some prayers or indeed recipes.

Just by the plain visuals: is this really the deep knowledge?
The plant's texts are not more than some short snaps, all pages with roundels are wasting very much space in a very small book as there are only written the round things mostly, the herbs are generally turnips and roots, all short texts there don't seem like sophistic alchemy magic at all and, honestly: watertreading have not been the highest level of medical art even in ~1460AD.

In total, these are themes that would have been considered as women's matters.
Is this book even written for men?
I am lacking the fantasy to imagine a man who shows nudies to foreign women, willing to teach them how to trample through water with that.
Even with loose moral of middleages this would have been the scandal of village every time.

So you can also see this book as made for women's use just as well as for and by "deep mentalitied men", which may find not much of their interest in VMS.
In the end, this could very well be an early House&Garden Illustrated or some household Almanach.

Regarding this very physical map, I even would tend to the idea that some kind of "wise women" or mid-wifes were send out with this book as a starter kit, to show (pregnant) women out in the country all basics of plants and growing them, easy medics, healthcare, weather and some entertainment. (which would be at least give an interesting look into (job)life of women in 15tCt). And yes, women could show naked-pictures to other women without being creepy)
Under these observations, it may have been written by women, nuns for example.

I know most of you still hope for encrypted wonders, each letter one word of magic or so, but the whole makeup of this pocketbook looks like a daily-use helper for pioneer women of caring.