If you guys are really interested in a debate on it there is one on that forum.
I don't know how you go from Beta to a "V".
Here is what one poster said about that...
My mother is Greek and I speak the language fluently.What most people don't realize is the Greek alphabet doesn't have a "B" sound. "Beta" is pronounced "Veeta".
That's why the Greek word for Beer is pronounced "Beera" but is spelled (substituting English letters here) the equivalent of "MPyra" because the mu-pi (MP) sound is the closest thing to "B" in the language.
So that's how you go from Beta to V.
Interesting the claim that all the decades of Greek Alphabet tables are wrong...
And from your link, the next two posts read:
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Yes, Greek doesn’t have a b sound now . 2500 years ago beta was pronounced as a b. Ask anyone who knows classical Greek.
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You’re quite right- the ancient pronunciation would have been like a “B”.
However, as you can see from this site, there are additional complications...
http://www.ancientscripts.com/greek.html