A question about an interesting article on dark matter

[Tanelorn]

This suggests to me that the early universe did not contain as much dark matter.
Is this correct? If so it might give a clue what D.M actually is?

http://www.space.com/36083-dark-matter-minor-ingredient-of-early-galaxies.html

 

[Chalnoth]

This suggests to me that the early universe did not contain as much dark matter.
Is this correct? If so it might give a clue what D.M actually is?

http://www.space.com/36083-dark-matter-minor-ingredient-of-early-galaxies.html

Our most precise estimates of the total dark matter density stem from the CMB, which was before any galaxies. Dark matter fraction estimates from galaxies tend to be far, far less accurate, because it's nearly impossible to measure the amount of dark matter that's between galaxies.

Thus this kind of result doesn't really have any impact on our estimates of the total amount of dark matter. Instead, it impacts our understanding of how galaxies form, and in particular how dark matter clusters during and after galaxy formation.