Not my area of expertise either, but I don't believe so. The dark matter (and energy) comes from very very large aggregate gravitational forces that are observed from galactic movement as a whole, but I think you already are aware of that, so I'm not saying anything new there, but I would certainly imagine that there would have to be a whole hell of a lot of extra-solar planets in order to account for what they're seeing, and it makes more sense (and they have presumably produced the stuff for a brief period in the lab) that there is an antithesis to matter (or energy) that is out there causing this behavior.