I do this for a living in the corporate space (also do talent development for K12) and the reality is it's not close to true. A leader can change the values of an organization in 45 seconds. Members can begin talking about the environment differently in about 45 seconds. But, "the culture" comes from actions, behaviors, and shared mindsets built over time. And, the reality is it often takes turnover and talent acquisition. You can help people develop skills. You're highly unlikely to change their personalities.
I don't know if our recruitment/player personnel department has performed personality and skills assessments, but each player should have a personalized development profile. The new versions of these assessments are not the stupid/fake surveys corporations once did. Every organization needs to be "people first" now because processes/info move quickly and are easy to copy. "People" are now the competitive advantage.
Mario can get us a bump through new values and accountability. Our leap to sustainable success will take a ground up approach through recruiting specific types of development-focused players.