An interesting perspective.
One of the criticisms of the university’s apparently intractable position on this issue is that it is an attempt to restrict what we might call meta-free-speech; the freedom to discuss issues of free speech.
Trigger warnings, I think, should neither be required not banned/discouraged. Course coordinators and lecturers should be free to decide if their courses contain material that might be disturbing. I know in my teaching (ethics) a lot of what we discussed was pretty confronting (that’s practically the point when you’re trying to get people to think about ethics).
Actual classes however should never be ‘safe spaces’. You need to be free to discuss anything and everything which might be relevant. The only restrictions I would ever put on class discussions is that they must be relevant and at least minimally civil and respectful.