Give or take a few thousand, the VM consists of about 170,000 glyphs.
This is comparatively much. More than enough to start statistics on it.
On the other hand, it’s not really that much. For really complex statistics, the text will be to short and the results meaningless.
What I mean is: Frequency analysis on a text of several kByte enciphered with a simple substitution will most likely reveal the underlying key. The same analysis on a text of 100 letters probably won’t result in much useful.