Why and how the text could be Bavarian

[Stefan Wirtz_2]

[..]
I have made it clear time and again that this is an ongoing project [..]

There are several people with „ongoing projects“ for 20+ years, without any success. This was just a reminder not to set much hopes upon „the time will work for you“, it will be quite the opposite.

Regarding double consonants: The rules for geminate spelling were not standardized in Middle High German - different scribes handled it differently. More importantly: if this is a personal abbreviation cipher, double consonants are exactly what one would drop first. ss = s, nn = n. That's not a weakness of the hypothesis - it's a predicted feature of it.

Yes, there were no real standards for spelling German at all until the 19th century; but there was never a time when no doubling occurred: some of them in words we are spelling different today, some the same as now. 
But I never heared of a script or scriber where those doubles were „compressed“ to 1 symbol for saving time (what?) with the risk of not getting it apart anymore: Raten ist nicht Ratten.
Did you find something like that in any other (German) script? How is that a predictable feature at all then?

And no, quite the opposite—as a German speaker, I would argue exactly the opposite: the more I think about it, the more convinced I am of this—simply because so much of it already sounds German even without the code. The strange certainty in your “under no circumstances” makes me wonder—did I hit a nerve somewhere?

Just a random shot from VMS, here 10v:
   

With lots of q in it: how is that a German text? Which type of text structures like that, with many repetitions of a starting character, do you know from our language? Maybe a poem, a prayer? But what about those ˋVords´ that vary only in a letter at each second-last position, but in a line of 3, 4, 5 words?
Where ist it „German sounding“ already? If so, simply translate a short sentence with already „sounding-familiar“ words of your table. And then just the following one.
I see you are hitting the nerve of this forum: „it must be German!“ + „in a most clever encryption!“ or „it is Latin!“ (it isn‘t either), all now turning to somewhere in the Alps or with clear sight onto them — but hitting nerves may be only a loss of time…