No text, but a visual code

[ololololo]

You think that in Quire 13 there are all kinds of human organs, but I think they are images that mostly allude to the medieval cosmological conception with tubes passing through the planetary spheres.

Maybe you're right, maybe I'm right. This interpretation is also justified. 
However, it should be noted that in addition to determining the writing style, it is also necessary to determine the "target audience". They are the people who will be able to read this and use it. Plus, when you say that the Voynichese system is not something exotic, you have to explain why it is unique and why we can't read it. The universal clause for this case is that the information was hidden, i.e., encrypted. The universal clause for this case is that the information was hidden, i.e., encrypted, and the method of writing the manuscript could not be understood by everyone.
However, I find this astrological approach quite fruitful, as long as it focuses on a system rather than a series of coincidences.