Oh, you mean this footage?
https://youtu.be/ksIXqxpQNt0
She didn't once say she wants to put coal companies out of business. She just said it's going to happen - and in later elaborations, she mentioned that's because of both fracking and increased regulations - and that we need to do something for the people who it's going to affect, e.g. bring the clean energy jobs to those areas.
And that's why she was in West Virginia. To reach out to West Virginians. Because, as with everything about Hillary, she cares.
Two states going first is not the same as the entire delegate rich deep south. Nothing Bernie said was wrong. He's implying Hillary appeals to voters who live in the south (true) but that moving up north would tap into different demographics. And he's right. If the Bernie hypothesis was right, liberal voters in the North and the western seaboard as well as more rural Americans would flock to Sanders, and so the politica reality would look different.
Of course, he was wrong, and he lost big time in New England. But that doesn't mean what he said was incorrect at the time. He never once said the South doesn't matter.
But his proxies came close, and his supporters outright said it.