Actually it talks about more than that. Right-to-carry laws are one of eight chapters in the entire report as you can see from my first link. Look at the last sentence of the passage you quoted. "The committee found that the data available on these questions are too weak to support unambiguous conclusions or strong policy statements." That is support for Huemer's argument that laws should not be passed if there isn't strong evidence to support their effectiveness.
The report also concludes this like I originally stated
However, although all of the studies use the same basic conceptual model and data, the empirical findings are contradictory and in the committee’s view highly fragile. Some studies find that right-to-carry laws reduce violent crime, others find that the effects are negligible, and still others find that such laws increase violent crime. The committee concludes that it is not possible to reach any scientifically supported conclusion because of (a) the sensitivity of the empirical results to seemingly minor changes in model specification, (b) a lack of robustness of the results to the inclusion of more recent years of data (during which there were many more law changes than in the earlier period), and (c) the statistical imprecision of the results. The evidence to date does not adequately indicate either the sign or the magnitude of a causal link between the passage of right-to-carry laws and crime rates. Furthermore, this uncertainty is not likely to be resolved with the existing data and methods.