The Voynich Ninja

Yes, that fits for the most part.
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There's an interesting comparison between the old image in post #55 and the version for Albert VI in post #58. And the second source helps to interpret the first representation.

In the first quarter, five gold eagles on blue is Lower Austria. The Wappenbuch version is okay.

In the second quarter, Upper Austria has two parts. An eagle and some red and white vertical stripes. But the colors of the eagle and the background, black and gold, are reversed.

The third quarter is the Duchy of Styria. It is a silver lion rampant of green in the modern version, but it looks more like a griffin in the Wappenbuch and it is flipped to face the center.

The fourth quarter, Carinthia, also as two parts. the first part has two or three black lions/leopards/panthers on gold. And red with a fess argent is the Duchy of Austria.

So what's up with the discrepancies? Not that it matters in this example. However, heraldry is supposed to be consistent. This has some problems. If an investigation demands a high degree of visual similarity to substantiate identification, then discrepancies like these may constitute a technical disqualification for some researchers. If such variations occur where there is no intention of disguise, just think what a little intentional trickery could do.

I guess that the black eagle on gold is the correct one. Tha was emblem of the Holy Roman Emperor (it was used as such in the devices of the Duchy of Milan).

A similar device as the top-right appear in the You are not allowed to view links. Register or Login to view.; it is labelled "Allamania" which I interpret as "Germany".
A better fit appears in Wernigeroder (Schaffhausensches) Wappenbuch - You are not allowed to view links. Register or Login to view. as "das lande ob der Ens", i.e. the river Enns in Northern Austria.

So, here is the current 'official' version.

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It's a gold eagle on a black field.

Also a difference of representation on the other half as to whether a red stripe comes first (at the center line) or a white one

Is it human error or something else? While it probably is not necessary to resolve this example, it does seem to show that variation can occur where it is not supposed to.

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Actually, you're both wrong.
It is silver on red.
But you are also both right.

The flag with a golden (yellow) eagle on a black background. Since 25 April 1949.
Before that, the eagle was silver.
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The black eagle on a yellow background, as seen in the coat of arms book, probably comes after the Habsburgs took over.
Before that, the eagle was in silver on a red background.

Be a little more precise in your research. Look for cross-references. Also read Wiki in other languages. Look at the difference between Wiki English and German.

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And while I'm at it. On the subject of pointed crowns.
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And who was Johanna von Pfirt ?

What do the graves tell me?
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Thanks for the checkup. Just to be clear, silver and white are equivalent and interchangeable in heraldry, not two separate tinctures. There is no "white" in heraldry. The term is 'argent' (silver), but it can be (and often has been) represented by white.

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Folio 51 assigns a different style of crown to each of the holy dignitaries (late 15th century) and there are more crowns on folio 55 and 162:

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(There are also a number of distillation vessels on the later folios.)

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How would one rate the third crown as a close example?

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This VMs crown has pointed embellishments, where other possibilities do exist. However the VMs example has only four such pointy ornaments showing where most all of these others already have more points showing in the visible part. The VMs crown might have one or two other ornaments not shown and these other ones are going to add another half-dozen - a fairly clear difference, IMO.