Free speech = the government can not stop you from voicing an opinion, in a nutshell. There are laws that limit certain aspects of speech (fraud, defamation, etc), and as mentioned, there are consequences to free speech. Go ahead and yell "Fire!" in a crowded theater - but you're financially responsible for damages, and headed for prison if anyone dies.
Free speech means you have the freedom to say it. Others have the freedom to listen, or not.
A sample of one - the campus I recently departed bears no resemblance to the one describe in the linked article. In the States, a public university is supposed to be treated as a free speech safe zone, more or less (there's an actual term that I can' recall at the moment), so on my campus, any d!psh!t who wanted to talk was permitted to do so. Hate speech was not permitted, and on rare occasions, someone had to be removed. Students did sometimes stage protests on certain issues that coincided with speakers or events, but there was never any obstructions or efforts to prohibit anyone from having the opportunity to speak.
There was a local guy who called himself Superman. He dressed in a Superman costume, drove round town yelling out the window, stood on street corners yelling at drivers, and drove around campus freaking people out. He mostly drove and hung out downtown, he only showed up on campus a few times a year, for a few days at random times. He's a nasty racist most of the time, but on campus, he didn't usually say anything at all. What he did might have actually been worse - he would find one or two students of color who were walking by themselves, and drive directly behind them, with his window down, blaring music and staring at them. Wouldn't say anything, just stayed right behind them in his car, blaring music and staring. Once they went into a building, he would slowly drive away, then speed up and go looking for more people to follow around, doing nothing but creeping them right the hell out. And there was nothing legally binding that could be done to stop him - what could they charge him with? It's not illegal to be a racist, or a creep. And the campus was really kind of trapped - not only is it a public university, the two main streets actually belong to the city, not the college. He always gets chased off eventually, but there's no mechanism in place to force him to stop altogether.
I find it unsettling that there seems to be a significant segment of a generation here that does fit the linked article. I was often surprised by how unclear the concept of free speech actually was to a lot of younger students, by how willing they were to relinquish certain rights, and by how much they misunderstood other ones. For some, it was literally the first time they had ever been exposed to the idea that citizenship comes with responsibilities, even for citizens who were born here - yes, that happened.
I know a couple of people (adults, with cars, jobs, and drivers licenses) who have never been outside the seven county metro area of Minneapolis. I know adults from rural Minnesota who have never been in a city with a population bigger than 75,000 people. I know many adults who have never left the state, and many who have never been further away than the next state over - Wisconsin, North or South Dakota, or Iowa. That's it, that's all the larger their world experience extends. When your world is that small, your frame of reference doesn't have room for much. Potential discomfort must be nearly everywhere.
It's contradictory - we "value" individualism, but enforce conformity. That ends up having all kinds of weird free speech consequences.