I don't have a dog in this fight, but just to answer the question. https://elonsbrokenpromises.com and https://elonmusk.today have examples of promises Elon has made that have not come to pass.
Edit: The first one:
“Short via long dated put options” …
Is it not a conflict of interest for someone who is shorting Tesla to maintain an “elonmusklies.com” website? Or is the disclosure of their short position enough to excuse their bias?
Continuing to read …
You may not have a dog in this fight, but these two websites are a little dishonest about how they frame things. Also there's a clear conflict of interest, because they're disclosing a short interest in the stock.
It's because he actually makes these projections while all the other CEOs are tight lipped. Elon is also right on Twitter, loud and center. It takes rational thinking to understand that what he says are speculative projections.