Kind of a silly take in my opinion. While it's may be true that the majority of money in a medical transaction (which is inflated) doesn't go to the insurer, it goes to the provider, it doesn't change the fact that "insurers" absolutely add a layer of uncertainty to the process. In times of uncertainty (ie: getting sick) anything that adds uncertainty will rightfully be hated.
In Canada, their system has a number of major shortcomings. But in college when my girlfriend got appendicitis, I just took her to the hospital without worry about in/out of network, and without worrying about if we'd get a claim rejected after the fact and have our small college student bank accounts drained. That is huge, and should not be underestimated. Here I do not have that luxury. Even though I have plenty of money saved up, it doesn't ever feel like enough. If one of us has a major illness, it can get wiped out due to a claim denial. And who makes the approve/deny choice?
The author of that post does some bad thinking here by completely missing the source of the vitriol directed at insurers. While providers do charge out the ass, at least they are doing something useful, while in these times of great uncertainty and pain, insurers only rent seek, blood suck, and do not offer anything of value.