He's selling courses on the technology he used, so the site is both a demonstration of and lesson in what he teaches. It's a functional portfolio that seems intended to demonstrate that the author and instructor understands what he is asking you to pay him to teach.
Understanding when and where to deploy technology is much more important than just using everything. Sadly that's much harder to teach.
Agree 100%. By erecting this over-engineered gold-plated edifice the author has demonstrated knowledge, but not wisdom.