I think you are confusing the general training lab videos with the HP Mass stuff.
The training lab videos contain a lot of information about the different kinds of workouts than CT did, mostly with Daryl Gee.
HP Mass is a single coherent program that is based on the same principles.
However, the training lab videos are examples of various methods CT uses and do not form a full, coherent program.
All the information about the HP Mass workouts is in the HP Mass articles which are linked together using the "More in this series" or something like that sidebar in each article.
The band stuff was shown in some training lab videos. Feel free to use stuff like this either in your own program or on top of HP Mass. If, however you want to know how the standard HP Mass workouts are set up check the HP Mass articles and the Neural Charge section for NC workouts.
Do not confuse the general training lab stuff with the specific basic HP Mass program.