I am curious: how did you come up with him as the author? I don't think anyone else has proposed him before. This is interesting but before you can name the VM's author as Giovanni Aurispa, you need to do more work to prove it.
For example, Aurispa was an historian and is known for his manuscripts collection and his copying and promotion of the Greek classics. He is not known for his own works, of which there were few. I found nothing to suggest he had any background or expertise in herbology, botany, pharmacopeia, astronomy or cosmology either (nor alchemy, as several have suggested). So if he is the author of the VM, how do you explain the rest of the manuscript?
If the methodology you used works for the folios you translated, then it should work for at least much of the rest of the VM. Translate that and if it also makes sense, and matches any related images, then you might be onto something.
It has been suggested, possibly proven, that multiple persons were involved in the VM's creation. If that is so, then Aurispa couldn't have been the sole author. In which case, who co-wrote it?
Aurispa also seems to have been a highly respected person. He had to leave Florence in 1427 or 1428 due to some disagreements but other than that I found nothing to suggest he would have needed to write anything in code. So why did he encipher the text?
And finally, have you compared the VM to anything in Aurispa's own hand? Graphology may be considered a pseudoscience and it is rather like comparing apples and oranges to compare handwriting in an unknown cipher to handwriting that is not but there may still be some conclusions that could be drawn from such a comparison. I found only two samples of Aurispa's handwriting, both copies published in the same book (PDF page 37):
Carteggio di Giovanni Aurispa edited by Remigio Sabbadini, held by the Bodleian Libraries, Oxford, scanned by Google
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It will be interesting to see you further develop your theory.