Because the title is accurate? It isn’t that New Jersey accents are the applicants who lose out the most it’s that those are the people who suppress it the most. That’s irrelevant to the title and is just an interesting fact pointed out by the article.
The odd thing to me (as someone born [if not bred] in the south) is that I grew up with a bright distinction between "poor whites" and "white trash", but as far as I can tell now (safely on the other side of the Atlantic) the "culture war" —even on Fox' side— seems to be doing its best to conflate the two notions.