The law is on Spencer’s side here, but Charlottsville demonstrated that the law is empty and meaningless: they had a federal court order for the rally, but the state of Virginia simply ignored it. And no one has been hauled up before the judge for it. Same will happen here. Spencer will sue. He’ll win. And Texas will just ignore it.
Being invited by the university or a student group is a reasonable expectation for any one outside of the campus to come and speak or hold a rally.
Now, perhaps a group of Aggies will form a student group and hold a white nationalist rally on the campus.
However, I think that if such a student group were to be formed on the Texas A&M campus, that the Battalion or other news organization would publish the names of they students who filed the paperwork to form the organization.
That’s part of open records and that’s the First Amendment.