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Nornagest comments on Open thread for December 9 - 16, 2013 - Less Wrong Discussion
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We should have the data now to take a whack at the metallicity side of that question, if only by figuring out how many Population 2 stars show up in the various extrasolar planet surveys in proportion with Pop 1. Don't think I've ever seen a rigorous approach to this, but I'd be surprised if someone hasn't done it.
One sticking point is that the metallicity data would be skewed in various ways (small stars live longer and therefore are more likely to be Pop 2), but that shouldn't be a showstopper -- the issues are fairly well understood.
The paper mentions a model. Maybe the calculation is even done in one of the references. The model does not sound related to the observations you mention.