Red shift, which is simply Doppler shift of the visible light spectrum, is how we measure the expansion of the universe. So anything being said in your video about dark matter that is dependent on Red shift meaning something else is based on false premise.
You apparently are 100% absolutely certain that the doppler effect is causing the Red shift. I'm not.
Can you explain why the red shifts appear quantized? Do you assume that the differences in redshift among apparently associated items is always an illusion?