“...is just saying they will invest profitably”...

Couldn’t be more false. Existing coal companies can easily make money for investors when they trade at earnings yields of 25%. no new coal plants need to be built. Coal can even be phased out. If you get 6-7 more years of earnings at a flattish 25% earnings yield you can do very well. This is why deep value investing works on average.

As a layman: Governments all over are phasing out and closing coal plants in favor of newly built sustainable energy plants. That means sustainable energy companies will be on the rise while coal will be on the decline.

Which makes intuitive sense but doesn't take into consideration the price you pay for the investment, which is the primary factor in determining your returns.