Is there any protocols to identify what sort of document MS-408 is?

[ReneZ]

This is worth trying, and not too difficult. It will all depend on what one calls 'significant'. Moving the conditional h2 up from 2.2 to 2.5 can be called significant, but still a very far cry from the values for medieval European texts which are 3 upwards.

Now I strongly suspect what you are going to comment on that, so indeed (as Bennett already pointed out) some Asian languages operate in the region close to the Voynich MS text. If you look at this page: You are not allowed to view links. Register or Login to view. , you will see that a Chinese dialect (Minjiang) converted to alphabetic characters, and Tagalog both outperform his suggestion of Hawaiian.
The same page also shows that it is more informative to look at the entire bigram distribution than just the entropy values.