To be precise, they published it in a herbal medicine magazine.
In fact, good Voynich research has come a long way in the last few years, with many excellent presentations at the 2012 centenary conference in Frascati. My own presentation there was on what the marginalia (particularly the quire numbers) and gatherings / rebindings tell us about the early history of the manuscript. Specifically, we now have a reasonable body of evidence from multiple domains that tells us a lot about when and how the Voynich Manuscript was written, none of which is compatible with Tucker & Talbert’s conclusions without Tardis-like intervention.
Incidentally, parallel hatching had only a very brief period when it was in active use (it was quickly replaced by cross-hatching, which was more expressive).
The first problem is that all the basic stuff they should have addressed runs counter to what they claim - making historical claims on an analysis of a single (and much contested) aspect is problematic at best, a recipe for epic fail at worst. Reconciling a 16th century narrative with multiple domain 15th century dating evidence is always going to involve some kind of awkward wriggling.
The second problem is that even though there has already been quite a lot of discussion both about plants and about Nahuatl as a possible source for Voynichese, it really doesn’t appear that they engaged with either to any significant degree.
The third problem is… oh, I’m going to stop there before it goes all TL;DR. 
I would be delighted to point people to such things, if they existed: but Voynich research has been dominated by poor thinking (read: “crackpots”) for so long that it is hard to find a place to publish highly technical articles on non-cryptographic aspects of it (for which Cryptologia is good).
I try to consistently use “Voynichese” to refer to the non-marginalia text in the Voynich Manuscript, though sometimes I do use it to refer to the way Voynichese writing works, mainly because referring to that as the “putative cryptographic superstructure underlying the Voynichese text” is a bit clunky, even for me.