Some people just itch to use something custom and then to have to think about it. Which can bring amazing results, sure, but it can also bring spectacular disasters as well, especially when we're talking about crypto.

The article is less about crypto and more about improving UUID (and IDs in general) with small block ciphers. It's a low impact mechanism to avoid leaking data that UUID by design does leak. It also doesn't require a good source of entropy.