Healthcare is also the fastest growing employment sector.
There are huge inefficiencies in the US healthcare system. We pay more to provide equivalent service as other first world countries.
However, switching to a single-payer system with a snap of one's fingers will not solve those inefficiencies, and will create massive upheaval in just about every Americans life, and our economy in general.
The article is pointing out that if the government sets prices at which all companies decide they cannot profitably render services, 20% of our economy and 16 million jobs just vanished. No candidate has addressed this issue.
If the jobs you describe are necessary, then they will continue. If they are not, they might go away. That's how things work.
We've had a long time to find these inefficiencies you describe, and yet all they've done is multiply. Cutting rates means leaving less room for inefficiencies, and is the most certain precursor to eliminating them that I know of.
So yes, any serious proposal to address the cost of health care in America will include cuts to the costs of health care in America, which includes hospitals, doctors, and so on. This seems blindingly obvious.
The linked blog post seems to want the current system to be preserved as-is, with no cuts to anything. Which is a viewpoint, but not a very popular one.