Maybe there is a moderate position here between, censorship is not a problem and “it’s a big problem.”

Something can be uncommon, but still be a big problem for the individual impacted. In higher education, there has been a legitimate trend in professors getting terminated, and it’s discussed in places like the chronicle of higher education, and written about by very middle of the road progressives like Stephen Pinker. I don’t think it’s the only problem our universities must solve, and defenestration isn’t a new thing, but it matters by degrees (no pun).