You yourself cited the requirement to be expression neutral. And I have provided links showing they weren’t and that multiple student groups are suing because of it.
Are the students expected to just sit back and stay silent when the university doesn’t allow them to express themselves on equal terms?
That’s literally what protests are for, and also literally why charges were withdrawn against a whole bunch of students in at least one case, because it wasn’t a “clear case of trespassing” when the students protested peacefully.
At least one police department has already figured it out