The Modern Forgery Hypothesis

[ReneZ]

So the question is raised how and where.
The available evidence suggests a clear and straightforward way. No need to repeat it.

About "how and where": there is a need to repeat it, especially in scientific publications, because fake stories get repeated so much that they remain the default, in saecula saeculorum, if nothing is done to rectify them.

I tried to add a sentence on Wikipedia challenging the villa Mondragone story, with the source of the alternate story from your website: it was reverted because many more sources mention villa Mondragone, so it must be the One True Story...

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That is a bit sad, but it shows one of the main weaknesses of Wikipedia.
Now just the simple change of location from Mondragone to Castelgandolfo, by itself, does not fundamentally change the story. At the same time, there are many new details.

I admit that the web page you quoted is not likely to help, as it is something that has evolved over the years, and sort of intends to also show that evolution. I have been thinking of redoing it, but then there are so many things that I could or should be doing.... It is just not a high priority.

The right source is the quoted You are not allowed to view links. Register or Login to view..
This is quite long, in Italian, and covers many areas irrelevant for the present discussion.
I made an English summary, connecting it to the letters from Strickland to Voynich, You are not allowed to view links. Register or Login to view..

Again, this is relevant for the question how Voynich obtained the Marci letter (actually, the Voynich MS) but it does not answer it.