You continue to miss the point. What is observed does not prove the existence of Dark Matter, of any composition. All it proves is that something affects the way light moves through space-time, on it way to us, that is not consistent with GR, without some addition of gravitational mass we cannot see, measure or fully explain.
All it proves is that gravitational lensing, or what we associate with gravitational lensing, appears to be originating from something we cannot yet adequately explain.
What part of, "This technique revealed the dark matter ... containing far fewer galaxies than would be expected if the dark matter and galaxies were anchored together", are you unable to understand?
This is evidence dark matter and galaxies are not anchored together. This is evidence galaxies move through dark matter.