If Alice just wants to know the average height of the population, why is she doing a hypothesis test that the height isn't 65 inches? Since her hypothesis test

If Alice just wants to know the average height of the population, why is she doing a hypothesis test that the height isn't 65 inches? Since her hypothesis test is designed to help answer the question of whether or not the mean population height is 65 inches, why should we expect it to tell us anything about the mean population height other than whether or not it being 65 is consistent with the data observed?