Part 15 was actually only intended to show other possibilities you could do when using houdini, and not part of the animation workshop per se, as retargetting and pyro are sections unto themselves. The HDA I have setup for myself is very rough, and built only for my limited needs and uses, and as such, not ideal for a retargetting tutorial. It was more to demonstrate that you can build tools for yourself, specific to your needs, and use them when needed.
If you are interested in retargetting, a good place to start would be in the content library example :
https://www.sidefx.com/contentlibrary/kinefxapex-workflow/ [
www.sidefx.com]