Having "no accent" is like having "normal hair" or listening to "normal music". There are accents associated with groups of white people (or with regions that are populated by large numbers of white people), but what you're calling "no accent" is how white people talk in the middle of the country. Yes, someone from the south might have to work to lose their accent (or at least make it more "telegenic") to get a broadcast career whether they're white or not, but you're still talking about a case where the standard is white.
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See also: "mainstream people".
Having "no accent" is like having "normal hair" or listening to "normal music". There are accents associated with groups of white people (or with regions that are populated by large numbers of white people), but what you're calling "no accent" is how white people talk in the middle of the country. Yes, someone from the south might have to work to lose their accent (or at least make it more "telegenic") to get a broadcast career whether they're white or not, but you're still talking about a case where the standard is white.