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Disney is an entertainment world leader. There's no reason to think their approach would work well for a university.

Disney's corporate culture encompasses more than what the company believes. Rather, their culture encompasses everything about the company's approach. It doesn't sound like that's what's being discussed at these workshops. If the slogans aren't being matched with changes in leadership or changes in policy, they are just slogans.

You're right about a mission statement's intended purpose. But in practice, mission statements usually have no impact on a company.

You say the author must want something else that leadership is offering. That is not necessarily the case. It sounds to me like the author thinks the university's culture is already good, and doesn't need work.