I have not watched the video posted on this thread, but I happen to know of this method or technique (if we can call it that) of the 6Rs. It is also called TWIM (Tranquil Wisdom Insight Meditation).
It was the teaching from the late bhikkhu Bhante Vimalaramsi at Dhamma Sukha Meditation Center:
https://www.dhammasukha.org/the-6rs
In this link there is a video instructions of the meditation:
Instructions for Metta or Lovingkindness Meditation and the 6Rs by Bhante Vimalaramsi
There are many talks by Bhante Vimalaramsi on Youtube about metta bhavana that leads to jhana.
My guess is that Delson Armstrong is now the principal teacher at Dhamma Sukha.
Best,
Lang
