No, the difference can only be in the intent. A hoax is fantasy deliberately and knowingly presented as truth. Therefore, in order to be a hoax, a text has to convey meaning. Glossolalia, grapholalia if you prefer, is something else again: it is meaningless.
Back to Rugg. The gist of his argument is that using a Cardan grid you can generate text with the same properties as the Voynich. Therefore, the Voynich is a hoax. That does not follow at all.
Using an English dictionary and an English grammar, you can produce stuff with the same properties as English. Therefore, anything written in English is a hoax? Humbug.
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