Hi.
The In Depth Chin Na series (including the In Depth Taiji Chin Na series) is designed with Dr. Yang speaking directly to you (the viewer) he demonstrates the techniques, uses victims, makes corrections and spends time discussing the details, etc. The In Depth videos eventually cover the same techniques as the NON In Depth videos, but in greater detail.
All other Chin Na (that is NON In Depth) is constrained to performance only.
Summary:
Non In Depth videos cover many techniques quickly.
In Depth videos cover fewer techniques slowly.
Hope this helps