He's (possibly) overselling his accomplishment here a little bit. You can achieve what he's describing using a combination of Plex, Sonarr, Jackett, and a private torrent site. You also need a torrent client that can work with Sonarr (Synology's torrent client works great in "watch this directory" mode).

It's a truly self-running system. Other than the upgrades, you're able to select whatever shows you want to follow, and that's it. They automatically get downloaded, sorted into the right directory structure, picked up by Plex, and on-demand streaming around the world is yours, with all kinds of cool features like bandwidth optimization, offline show downloads, etc. More or less feature parity with Netflix, without any of the restrictions.

Of course it's 100% illegal, though honestly I've never heard of a prosecuted case in the US.