Though widely touted, there's no such thing as "free speech" in academia. Instead, there are two sets of standards: One for a largely far-left-wing, postmodernist type who reject science and basic decency; and a second for everybody else.
Surely, somebody can stop the most egregious offenders from spreading health misinformation that hurts or kills people, right? Actually, no, not in a free society. The only solution to fake news is better news.