I have read some of the School of Frankfurt authors in my early twenties and I really loved them, especially "Loving - an Art" by Erich Fromm (I don't know the exact english title). I was impressed and overwhelmed by the positivity and the love for humanity which was expressed in this writings. Maybe that's what the authors of this essay linked in your post didn't like and consider as a destruction of society.

I don't know much about PC straightjacket in other countries. In Germany I cannot remember that I have worn any. Or maybe I just moved to little so I was not able to feel my bonds.