Why the Voynich Manuscript Might Not Be a Real Language

[ReneZ]

The Voynich Manuscript, transcribed using the EVA alphabet

Others have already pointed this out, but it feels worth repeating: this explains a significant part of the behaviour of the graph. 

Use modified transliteration alphabets and see what happens. 
At least convert Ch Sh in and iin to single characters.

Also a question: are space characters treated just like normal text characters?

Your result is quite different from my results here: You are not allowed to view links. Register or Login to view.
where Voynichese becomes less predictable after 3 characters, but that is probably due to the way in which I treated space characters, namely as separators.