I go twice a week, and have been doing so (roughly) for the past two years, except for a period of a few months where I had a hernia repaired. The origins of the hernia were 5-6 years old, and it never was very painful or caused much in the way of problems, and I actually think that a year of CF actually helped reduce the severity of it (and my surgeon agrees).
Thess days, I take things much easier, but am still making progress against my personal goals.
So at the end of the day, does the author have valid points? Sure. But I think, like pretty much everything people are passionately for or against on the internet, the truth is in a gray area. It's not as black and white as I think the author is making it out to be.
CrossFit has helped a lot of people, myself included. CrossFit hasn't helped some people who have tried it.
You could replace "CrossFit" with "college" (or a lot of other things in life), and I think you'd find that again, the truth is really in a gray area, somewhere in between the opposing factions.