The only coal plant being built is a tiny one for a university in Alaska. Three more have been in regulatory hell for so long that they're no longer profitable compared to every other energy source, especially natural gas. Coal is dying but no one told Trump.
It's also worth mentioning that steel can theoretically be produced electrolytically[2] (like aluminum). It's... essentially vaporware, but who knows. It's one of the Big Dreams: more energy efficient and pure oxygen as a byproduct.
[1]: https://en.wikipedia.org/wiki/Direct_reduced_iron
[2]: https://www.scientificamerican.com/article/cleaner-cheaper-w...
He also knows that by being the one guy who promises to prop it up with government support, he can gain the support of groups that might otherwise vote Democrat.
The people who care about the environment and efficient running of the economy based on facts weren't going to vote for him anyway.
With his track record of not listening and blaming FBI, NSA, and CIA, I think Trump is just too lazy to listen.
Also I think he lives in an alternate reality, his tweets are riddle with lies and also anger.