noun: censorship: the practice of officially examining books, movies, etc., and suppressing unacceptable parts. So if MSU, a public university, officially examines and suppresses the speech of certain ideas, then (by definition) that is censorship. If MSU censors ideas because they receive a lot of grant money in opposition to the ideas, that is even worse. No one is asking for MSU to endorse these ideas, merely for space to present them to a willing audience. I agree that MSU should not be required to endorse every speech made on its campus, but that is not what is happening here.
I agree that you can't just do an emergency broadcast at the White House. But that is irrelevant. No one has to show up at their event, or listen to it. They're being allowed to present a point of view, and those who WISH to hear their point of view may listen to it. That's nothing like an emergency broadcast.
The university sees this as a free speech issue too. The article says: "University officials say they have no plans to interfere with the event. “Free speech is at the heart of academic freedom and is something we take very seriously,” said Kent Cassella, MSU’s associate vice president for communications, in a statement. “Any group, regardless of viewpoint, has the right to assemble in public areas of campus or petition for space to host an event so long as it does not engage in disorderly conduct or violate rules. While MSU is not a sponsor of the creation summit, MSU is a marketplace of free ideas.”