On purpose

[Mark Knowles]

I am sure you are completely wrong there

Why?

If the VM was made ca. 1420, its makers were born in the late 14th century. But even if you want them born in the early 15th century, the difference is still significant. Copernicus was born 1473 and became a full-blown Renaissance astronomer that gave the Copernican revolution its name. He finished his studies in the early 1500s. 

I agree that we don't have to rely on stereotypes, but I see no point in denying that the Middle Ages were different from the Renaissance, that is what they get different names.

It is unquestionable that the Voynich was written during the Italian Renaissance. Whether the author was influenced by renaissance culture depends on where he/she/they came from. Given the distinct possibility that the author was from Northern Italy it makes sense that the author could have been influenced by renaissance culture.

As far as I can tell nobody dates the start of the Italian renaissance to much later than 1401, though some would date it significantly earlier. The writing of the Voynich coincides with the Brunelleschi's construction of the dome of Florence's cathedral.