As a big esteemer of the metal scene, I also inquired once whether the subject of the VMS found its way into the lyrical themes; to my surprise, the instances appeared to be not so numerous.
The technical death metal band You are not allowed to view links.
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Login to view. from France has a two-part composition "Voynich Manuscript".
I was not aware of The Voynich Code band.
Unfortunately, I was not impressed by neither. There is a good saying "de gustibus non disputandum", but to me technical death metal is actually all about solos, and when there are no solos it's just boring. Like one friend of mine put it, speaking of Necrophagist's [amoff]You are not allowed to view links.
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The theme is explored in other genres nonetheless, and the Discogs search query for "Voynich" yields some results (though again not too many).