I finally watched the whole video here:
https://www.youtube.com/watch?v=2-WSmFtKBik
It is indeed interesting and the way he works with layers and selections
produces results that is basically impossible to get with Lightroom:
dodging and burning, as he stated, brings less control and requires a
much bigger time investment.
I can see using that technique in the future for some very special
photos, but I am already afraid of the suffering caused by using GIMP.
Olaf