My comment is that the CEO of the worlds largest coal producer...

My comment is that the CEO of the worlds largest coal producer is not likely to be unbiased!
China is the main driver of energy demand currently but they can supply their own coal locally and probably export more.
The increasing awareness of global warming puts coal into last place and the costs of making it clean will detract from its appeal.
In any case production will move to countries where it is cheap to mine, eg Indonesia. Advanced countries will be moving towards renewable energy. Supply can keep up with demand currently and if there is a growth slowdown oversupply will eventuate, so whilst volumes are rising profit margins are likely to fall.