Elon Musk is a tricky Man and wouldn't want anything that would bring or drag his name to the mud. He has gotten what seemed impossible the Twitter now X , is probably a big win for him. Thinking of what he would go for next is just like asking who is going to be the next Pope.
Elon Musk would want to get to the Sun using AI , that may seems impossible but I know he is cooking something.
How about the WHO?
He may likely to buy that body and try to come up with vaccines that could fight sicknesses of any kind there making humans to live beyond 200years.