Looking back, TechRestore's original article is a list of what files can be found on the Apple TV hard drive. The Apple TV contains a stripped version of Mac OS X 10.4.7. Amongst other things, it includes Quicktime functionality to play back audio and video.
Every Quicktime install comes with Automator actions, including:
New Audio Capture
New Video Capture
These Automator actions can be found in any Mac OS X 10.4.x install under /System/Library/Automator and have no unique relationship with Apple TV.