Why and how the text could be Bavarian

[Grove]

Labelese could lack vowels if they are primarily numerical in nature.

I'm not even sure the vowel space theory or whatever it's called explains how the labels are made and decoded. For what I see labels mostly appear very similar to the running text, there is only some statistical difference in what combinations occur more in labels and in the text. So, if labels are numerical, does this make a large portion of the text numerical too?

Not necessarily. Some glyph pairs could match to a letter, a number, or a syllable.