I think what is significant in the article is that it shows that normal
matter gravitationally attracts the dark matter which then adds to the
total matter in the galaxy.

A way this could happen is if space itself were composed of ordinary
matter. It would be uniformly distributed and so wouldn't change the
attraction generated by real masses like the planets, etc. However,
since space consists of ordinary matter, it is gravitationally
attracted to the planets and causes the density of space to increase
around the planet. This increased density actually adds effective
gravitational mass to the planet. The compressed space around Earth,
might add 90% to the overall gravitational mass of the Earth. The added
mass is due to compressed space compared to space which has no
gravitational objects in it.

My description of space as being composed of ordinary matter
(neutrons/neutrinos or some bounded combination of proton/electron) can
be found in my theory of everything at:

http://www.geocities.com/franklinhu/theory.html
fhudark