No-one said they would be coal jobs
The only argument you could possibly have for that statement to be true is to argue that Trump's speaking style is so vague as to be meaningless. He did say this:
"We're gonna open the mines"
"Let me tell you: the miners in West Virginia and Pennsylvania, which was so great to me last week and Ohio and all over, they’re going to start to work again, believe me. You’re going to be proud again to be miners."
He told the miners to get ready to "work their ass off". He made several statements like those after Clinton said that, if she were elected, a lot of coal miners would be out of jobs. Naturally, Trump sensed a weakness and attacked. And people responded to him with statements like this:
One of [West Virginia's] delegates, donning a coal miner's hat, used the state's time to complain about how President Obama has wrecked the state's economy: "It has been devastating what has happened all across Appalachia and this country," the delegate said. "Tens of thousands of coal miners have lost their jobs over the last seven-and-a-half years under this administration - it's time we change course with a man named Donald J. Trump."
"I did vote for Donald Trump," Moeller says. "It's really hard to even say that because I so dislike his rhetoric. But I voted for him on one singular issue, and that was coal."
"I voted for Trump - I mean, a coal miner would be stupid not to," Hathaway says.
"He is a whacko; he's never going to stop being a whacko," Hathaway says. "But I mean, the things he did say - the good stuff - was good for the coal mining community. But we'll see what happens."
“I have said to Mr. Trump on a couple of occasions, 'Please temper your commitment to my coal miners and your expectations of bringing the coal industry back.' It cannot be brought back to what it was,” said Robert Murray, CEO of Murray Energy Corp., the nation's largest coal producer. “The destruction is permanent,” said Mr. Murray, a Trump supporter.
So, SuperKendall, why do you think all of those people would say things like that if Trump never promised to bring back the coal industry? Do a search for "Donald Trump coal jobs" and go and look at all of the articles going back to last May. Notice him standing on stage with a sign saying "Trump Digs Coal". He's got the CEO of the largest coal producer telling him to temper his promises to bring the coal industry back.