It cannot be a language - in reference to Koen's latest video

[Koen G]

I don't want to get too hung up on the number since I didn't intend this as a rule or a solution. It was just to demonstrate how "weak" some Voynichese glyphs are, and if you assume positional variation to solve this issue, the number of letters collapses. 

Hawaiian is treated in the video. My opinion is that for the purpose of the Voynich, the Hawaiian alphabet doesn't exist. If Hawaiians had invented their own writing system in the 15th century, it would have been one with a large glyph set, like syllabic or logographic.

Languages like Hawaiian aren't found in Europe or the surrounding areas. And alphabets were introduced to the region as part of missionary activities much later.

Commenters on the video did repeatedly mention the Younger Futhark. I don't know enough about this yet to see if linguistically it would be interesting to compare it to Voynichese.