You wouldn't be any less wrong if he did, I don't really see how that's relevant.
You can find other contemporary counter-examples too, for instance nuclear fusion. We know it's possible, it exists in nature, we managed to do it under very special conditions but it's still unclear whether it's actually possible to build a competitive, safe commercial nuclear fusion reactor.
You can find other contemporary counter-examples too, for instance nuclear fusion. We know it's possible, it exists in nature, we managed to do it under very special conditions but it's still unclear whether it's actually possible to build a competitive, safe commercial nuclear fusion reactor.