I find term to be so broad as to be useless. And, like the linked article, and like the litany of generic complaints about free speech on HN in the last few years, I tend to see it as convenient stand-in for people who know their opinions cannot be uttered in polite company.
Nobody gets cancelled for proving p!=np, or finding a new antibiotic, or coming up with a melody that is impossible not to sing along. So the shtick about conflating the (sometimes apocryphal) hardships of innovators in the Middle Ages with the bland low-level hate today's young adults come up with to compensate for their mediocracy is getting tiring.
[0]: obligatory disclaimer that the Galileo incident was at least as much about him deliberately pissing off the Church as about his scientific beliefs, which if I understand correctly you were allowed to express if you tried to be at least a bit subtle about them.
But we as humans tend to see things from the prism of a late concept we just learned about and gauge it against various models in order to test its validity. The problem is that in this case it is not about being valid but about some sort of subjectivity.
If I criticise the left it's not because I'm right, it's because I want the left to be better.