Well we could examine the history here, for instance when he bought Twitter that it would immediately collapse (now its more popular than ever and Bluesky is the one that's falling apart) and when the Cybertruck was announced there were lots of people saying it could never be made: https://news.ycombinator.com/item?id=21602437

It’s crazy how many Cybertrucks I see in my hometown, and I don’t live in that big of a city. They are incredibly popular. This car will be incredibly popular to. Peoples are getting bent out of shape about the “thrust” and “rocket” variants, but who cares? Those will be few and far between. For rich collectors mostly. How about just the base model? It looks wild, I’m sure it will be fun as hell to drive. They are going to sell a ton of these things.