Spirited Away is an intricate expression of Miyazaki's ethics as formed by his unique lived experience and nostalgia for classical Japanese culture, as well as a criticism of Western capitalist excess filtered through Shinto philosophy.

There is literally no universe in which a generative AI creates a work of art of that magnitude. You can get "make this meme is the style of Ghibli" from an AI and it can imitate the most facile properties of the style but that still requires the style to imitate. AI is never going to generate the genius of Hayao Miyazaki from first principles, that isn't even possible.