See this post from 2013 that refers to an even older post from the old forum:
https://forums.steinberg.net/t/cubase-vocoder/602275/23?u=mrsoundman
(quote from @Ed_Doll)
In the “about” dialog of Embracer, you can see that the original developer was Wizoo:
In 2005, Wizoo was bought by Digidesign, (who in turn were swallowed up by Avid, of Pro Tools fame). In 2008 then there was this announcement: Steinberg/Wizoo VSTi’s discontinued.