They didn’t omit that information. This is literally the last paragraph of the article right before the references:

> Funnily enough, a software-only exploit for the Xbox 360 dropped just last week , rendering my years of effort somewhat moot. Nevertheless, it was a fascinating deep dive into the inner workings of the console and the security mechanisms designed to protect it.

Because it's about how they modded their 360 and Peer Pressure was only released on the same day this blog post went up.