Comment by himinlomax

There are many aspects that point to the text not being completely random or clumsily written. In particular it doesn't fall into many faults you'd expect from some non-expert trying to come up with a fake text.

The age of the document can be estimated through various methods that all point to it being ~500 year old. The vellum parchment, the ink, the pictures (particularly clothes and architecture) are perfectly congruent with that.

The weirdest part is that the script has a very low number of different signs, fewer than any known language. That's about the only clue that could point to a hoax afaik.