I do agree that the repeated glyphs and almost-repeated "words" are a big red flag against "can this actually mean anything?", and I'm not sure the idea of abbreviations really explains that.

However, many medieval documents even in known real languages do contain almost undifferentiated glyphs one after the other:

https://en.wikipedia.org/wiki/Minim_(palaeography)

Not quite the same, but something similar might conceivably apply to e.g. the Voynich's c-like characters.