Nope. The general American accent used by the media is midwestern:
https://en.wikipedia.org/wiki/General_American#General_American_in_the_media
From the article you cite...
“The fact that a rural, broadly Midwestern dialect became the basis of what is General American English is often attributed to the mass migration of Midwestern farmers to California and the Pacific Northwest from where it spread,[citation needed] since California speech itself became prevalent in nationally syndicated films and media via the Hollywood film industry.”
Having lived in CA all my life, it always seemed to me that people on TV talk like people here do. Most people from the Midwest sound “hick” (as Midwesterner Rush Limbaugh calls it) in comparison.