That was the original moniker. Somehow morphed into Death Valley sometime (I guess) in the 70's or so. Younguns be clueless, scary clueless
Been going to games since the mid 70's & never heard anyone refer to the stadium as "Deaf Valley" but I do know that the term was around at one time and "Death Valley" arose from that. I've always heard Tiger Stadium or Death Valley. When people would bring up "Deaf Valley" I figured it was a mix up with the Pmac being called the "Deaf Dome"