Maybe you're referring to SpaceX in proving skeptics wrong? We have yet to see if that company ever becomes profitable. Reusing rockets is not what made people skeptical as much as pretending it'd make financial sense to do.
Most of his other popular pet projects are even more pie-in-the-sky. Neuralink? That's nothing but talk. Hyperloop? not a single prototype built in the real world, in a real location. OpenAi sounds like what a conspiracy theorist would come up with.
Not saying it isn't possible or what he has achieved isn't great. Just saying his existing successes don't prove what he's proposing will succeed, since, his new goals are as big or bigger than his initial as-yet-incomplete goals.
Maybe it takes more than 5 minutes to make all cities capable of powering electrical cars then competing with the existing car market? He's already built a successful product, has successful competitors, prevented the 2000's era proprietary cell phone charger fiasco from happening again. It's a little too late to be skeptical.