Some suggestions and theories

[Stefan Wirtz_2]

Well, first of all, you can see the same "jerk" circling over the pictures (and text in other places) - it seems more like an attempt to preserve the book contents (from fading out). And since this is the only place he "comments" on, I see no reason to assume that it is an extra addition, rather than a part of the original text.

First of all, some „jerk“ was very interested into adding female parts were none have been before; improving/preserving some characters was just his second idea, or even third.

I count the months‘ names to the same quill that wrote the page numbers into the upper corners — and so, it belonged to some much later „researcher“ who tried to organize the VMS a bit. Writing, letters, style, ink colour look much more like the numbers, not like the original charcters.

As for the zodiacs, that is just something you expect to see on your crazy esoteric bullshit bingo card.

???

>why on earth would the author or some scribe of VMS explain to us the only part that we can know
You know they are zodiacs, he knows that you know that they are zodiacs. What's the point of encrypting them if someone will be able to recognize them from the pictures?

He did not write „sagittarius“ or „taurus“ or „libra“: he added his understanding of the calendaric positions of those, which is quite not obvious at all, as others have other ideas about that. So the „non-encryption“ of months‘ names does reveal something — but not necessarily by the original VMS author. 

Those are clearly star names on those pictures,[..]

Are they?
And if so: why did the author encript those names, we could easily know them anyway, or not?
If there are repetitions of vords/star labels within completely different zodiacs (I don‘t know whoever checked this already): which zodiac constellations do share the same stars…?