Well, Tony Stark is a fictional character in a fictional universe, so real science or how the real world works in general don't need to apply to him and he only needs to conjure up some cool sounding tech words for the audience and the plot will do the rest. So Elon Musk is indeed like Tony Stark, only issue is he is also indeed the real life version so has no plot to back him up and all the rules of real life still apply.