It seems clear to me that it recognized the inscribed frame as such, making it 3D and rendering it in a 19th century style. I doubt it can recognize Voynichese specifically, it probably processes the glyphs as generic characters (it apparently can recognize them as "writing"). Rene's suggestion to submit a random pseudo-script sounds like an interesting experiment.
EDIT:
EDIT:


![[+]](https://www.voynich.ninja/images/collapse_collapsed.png)