No text, but a visual code

[nablator]

The choice of colors and of what should be painted, and the rather careless way the paint was applied, tell me that the Painter was a later owner who did not even understand the drawings. 

Writing was obviously careless too (unreadable or very ambiguous) a few times per page on average.

   

So by the same logic the text was written by scribes who didn't understand its meaning.