The point is not that he doesn't deliver anything, or that he never achieved any sort of success - he did, he is incredibly successful. The point is that he constantly oversold what his goals were and made promises that couldn't be kept, often to get the funding he needed to reach his definitely less ambitious concrete goals.

Yeah he made the electric car popular, but it can be argued that in order to make his company economically viable he basically lied to his investors and customers about self driving cars for almost a decade, when he had nothing real in his hands. Thanks to those promises he got the money to keep the company afloat until it had the manufacturing capability to actually deliver the cars they sold; and someone may argue he would have failed if he had been honest from the beginning, and that maybe people wouldn't have invested the money they did if he hadn't set unachievable goals to begin with

And this is a pattern you can see in all of his companies; he promises the world Mars, gets a lot of funding and then instead of delivering on the "dream" target, he uses the money to deliver a valid but definitely less "romantic" product he can actually sell. One time is ok, but it's basically a modus operandi now. And this gives me a strong suspicion that the product was the real goal all along, and he knew he had to lie about the "dream" in order to get the capital at all