It's long ago since I last looked at it, but the thesis is looking at a mathematical/statistical model of the text, and is not related to this more recent translation attempt.
I think it may be online now, but it is (of course) in French:
Méthodes d'analyse du langage crypte: une contribution a l'étude du manuscrit de Voynich: These pour obtenir le grade de Docteur de l'Universite Paris 8. March 19, 1999
Here's a link but without (it seems) the full text:
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there are several such links.
I only have a paper copy.