I think you're confused.  Or misled.  Ask yourself what all those workers are doing.  

We pretty much know what the coal guys are doing - digging coal. (I didn't see any discussion about the power plants required to turn that coal into electricity, but we'll ignore that...)

So what are those 270,000 solar workers doing? Digging photons?  Um, no.  They're busy building new solar capacity.  Get it?  Building, not digging.  

Here's a little thought experiment.  Lay off every solar and coal worker tomorrow.  How long do the lights stay on?  With coal they go out as soon as the piles are used up.  With those installed solar panels, the lights will stay on (at least during daylight hours) for the next 25+ years.  

Every year those 270,000 solar workers add more generating capacity to the grid.   The coal workers produce the same amount of energy this year as last year.  Coal electricity will continue to decline.  Solar power will continue to increase.  It's just math.