Yeah anything is possible with enough time and money, it's just that is about the most textbook example of comparing apples to oranges I've seen IRL.
Also, I suppose Lego bricks might be considered low cost if you're a billionaire, but in the grand scheme of molded plastics they are very much a premium product.
Maybe he can build the truck out of LEGOs - it would cost about a bajillion dollars to make something that size, but maybe less than the parts he's demanding would be.
Well, of course. It doesn't change my statement though.
And the guys down the lab could go "well, we don't have to make it out of metal." And then it starts a rabbit hole of further insane requests that are technically possible, but to people unfamiliar with engineering (Elon) say "damn the cost" betting (incorrectly) that the time or financial cost to fulfill the requests is still profitable.
Happens to a lot of products, unfortunately. People making demands are better off knowing what the demand entails. When they do not, this is what we get.
He's also probably confusing his experience with Space-X too. He can't think critically, and it's going to be his undoing. I hope at least.