I am not convinced by the provenance history of the VMS

[Oscroft]

Birth, marriage and death registers all contain a date for each individual entry. There are plenty of such registers that still have plenty of space left.

There are surely not "plenty of such registers that still have plenty of space left" that exist from the period in question.

I only know about the UK (from a genealogical perspective), but births, marriages and deaths back then were recorded and held by parish churches, and today there are very few still in existence even going back just 200 to 300 years - and we're only about 100 years on from Voynich. In genealogical searches, I've seen none at all dating back even close to the 13th century (which is what Voynich would have been trying to forge if that theory is true).

What was the chance of Voynich being able to find a dated document still in existence from the 13th century, and then gain possession of it from the church (or whoever else had it) to reuse the parchment? Enough parchment for all the pages of the VMS? I'd put it at at close to zero.

Looking at what I wrote and doing a bit of research...

According to the UK National Archives, births, marriages and deaths were not recorded at all in the 13th to 15th centuries. The only such records I can find information about are all much later and on paper - parchment would surely have been too expensive to waste on such mundane parish matters (even in other countries).