The whole article just says that a single encounter with a not-the-cool-tech-guy confirmed author's suspicions that there is no underground value in blockchain technology. Which is strange to hear from a professor in ML – the last person you would suspect to make such a generalization from the single data point.
And that's not to mention that observable "blockchain boom" is, in fact, just trading on the crypto-exchanges boom, which has nothing to do with actual potential and benefits of blockchain and cryptoeconomy, which is itself a field of research even more complicated than ML world.