Why and how the text could be Bavarian

[Rafal]

I would say you sound quite convicing when talking about Bavarian  

On the other hand if it is really Bavarian, why nobody was able to crack it?

Especially why nobody at the court of emperor Rudolf was able to crack it. Rudolf lived in Prague but he didn't speak Czech. Rudolf and his entire court spoke Austrian-Bavarian German. And they probably lived less then 200 years after Voynich Manuscript creation and the language hasn't changed so much then.

So that would basically mean that they weren't able to recognise their own language written with another letters.

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Personally I don't believe that it is Bavarian. I am close to nonsense/glossolalia theory, eventually mostly nonsense theory or constructed language theory.

But when it comes to the place of origin I am mainstream, believing it was somewhere around southern Germany, Swirtzerland and norhern Italy. So for me it is quite possible that the scribe knew Bavarian or even spoke Bavarian in his private life.

Therefore if it is gibberish then it could be Bavarian inspired gibberish  

Compare Lingua Ignota of Hildegard of Bingen ( You are not allowed to view links. Register or Login to view. ) which is quite clearly inspired by German.
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But I don't discourage you from pursing the Bavarian theory. It is actually quite an interesting read.