Why and how the text could be Bavarian

[JoJo_Jost]

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

...
But I don't discourage you from pursing the Bavarian theory. It is actually quite an interesting read.

First of all, thank you very much for the positive feedback.
That's rare here in the forum...

I also speak German and can read Bavarian, have extensive knowledge of the German language and still can't decipher it! At the moment, I'm just trying to create an encryption that generates a structure similar to VMS based on a Bavarian text.

However, I think the problem could be the following: 

if the gallows stand for groups of letters, then a lot of information is lost. If ‘ch’, “sh” and perhaps even ‘eva d’ and
other characters are structured in a similar way, even more information is lost. I have tried it with a few chiffres. The problem then is the reverse translation... To do this, you need to know:
1. which clusters are determined by the gallows and the other letters.
2. which vowels are swapped and how.
3. understand the trick with qo / o and other prefixes
4. solve the problem with the y at the end.
5. And most importantly: you probably also need to know what the text is actually about – simply because too much information is destroyed.

Not to mention that it may also involve a very specific dialect - including words, we dont know today.

That's also why I'm not sure it can be solved at all. Probably in a few years with a "super AI" that runs through all these possibilities and then finds the most suitable words for the whole book. 

I'm afraid this task might be too complex for a human being.

However, due to a structure similar to Bavarian, I dont believe it is a hoax. But of course, I cannot rule it out yet.