Hi Hendrik

Its true. Ultimate enlightenment (as I have read) is complete nonduality.

But I have also read from Buddhist scholars who's opinion I trust that there are records discussing partial enlightenment. "Nirvana with lingering attachments". Stages of samadhi even after the third eye opens.

I agree infinite change and transformation is the way of all things.

On the other topic:
Dr. Yang is not teaching the path of nonduality. It isn't enlightenment class. It is a class about Embryonic Breathing qigong practice - a very physical process with lots of terms and theories and meridians and vessels that will clutter the mind!

And the second day he is teaching Four Seasons Qigong - how to adjust your body to the changing seasons.

These are just tools for living well, which benefit the greater meditation goals if one is interested in such things.