Am I missing something? The example of a "poetry startup" is obviously meant to be an extreme case, but doesn't prove anything about a bubble -- rejected from Y

Am I missing something? The example of a "poetry startup" is obviously meant to be an extreme case, but doesn't prove anything about a bubble -- rejected from YC, miles from funding, no product, no customers. If this idea just closed a $500K seed round, it would be a different story. But people have been coming up with silly business plans forever... What makes this one a particularly convincing bellwether of the imminent pop of the 2.0 bubble?