Court ruled they didn’t demonstrate they were likely to succeed on the merits. They hilariously claimed it was a First Amendment violation. Even the University of Texas thought that was ludicrous, and the judge didn’t buy it either. Look, stupid people with PhDs: when a student sticks a gun in your face and tells you to shut up, that’s a violation of your First Amendment rights. It’s also a violation of a number of other laws as well, most of which are quite serious, as I’m sure most people with an 6th grade education can tell you. Someone merely having a gun is a violation of nothing, except in your apparently vibrant, child-like imagination.
The Texas university system being a taxpayer funded, state chartered institution, is ultimately controlled by the Texas legislature, who said gun on campus are fine. That’s pretty much the last word unless you can convince them to change their minds.