I think that part of his point was that in this case, intelligent people tried to design unstable bikes, and failed. Even their unstable bikes were stable. He's doing the obvious equating of Intelligent Designer and God. And since "God created the Universe", he made the universe like stable bikes.

to be fair, bikes were designed in an iterative process that included trial-and-error.

Though not design-from-first-principles, that's still design.