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
That isn't what the poster said is it?
. . . and I suppose they know that because archaeologists were able to locate ancient Greek CDs and working CD players in order to document this?