I can't answer for ExGOPer, but it seems to me he his making the point that this "report" in question seems to have never been subjected to expert criticism of the kind it would have been were it published in one of the standard, widely respected, peer reviewed journals. That suggests to me that one should be cautious in accepting its findings as correct.. Personally, I'm always suspicious of so called "scientific papers" if they haven't been peer reviewed by experts (which lord knows is not an infallible process) and especially if one or more of the authors is associated with a think tank normally connected with political rather than scientific discourse.
Having Breitbart reference it does not strengthen the articles probity; it weakens it.
From Page 2 of abridged research report PDF...
The Undersigned Agree with the Conclusions of this Report:
Dr. Alan Carlin
Retired Senior Analyst and manager, US Environmental Protection Agency,
Washington, DC.
Author, Environmentalism Gone Mad, Stairway Press, 2015.
Ph.D., Economics, Massachusetts
Institute of Technology, Cambridge, MA.
BS, Physics, California Institute of Technology, Pasadena, CA.
Dr. Harold H. Doiron
Retired VP - Engineering Analysis and Test Division, InDyne, Inc.
Ex-NASA JSC, Aerospace Consultant
B.S. Physics, University of Louisiana - Lafayette
M.S., Ph.D., Mechanical Engineering, University of Houston
Dr. Theodore R. Eck
Ph.D., Economics, Michigan State University
M.A, Economics, University of Michigan
Fulbright Professor of International Economics
Former Chief Economist of Amo
co Corp. and Exxon Venezuela
Advisory Board of the Gas Technology Institute and Energy Intelligence Group
Dr. Richard A. Keen
Instructor Emeritus of Atmospheric and Oceanic Sciences, University of Colorado
Ph.D., Geography/Climatology, University of Colorado
M.S., Astro-Geophysics, University of Colorado
B.A., Astronomy, Northwestern University
Dr. Anthony R. Lupo
IPCC Expert Reviewer
Professor, Atmospheric Science, University of Missouri
Ph.D., Atmospheric Science, Purdue University
M.S., Atmospheric Science, Purdue University
Dr. Thomas P. Sheahen
Ph.D., Physics, M.I.T.
B.S., Physics, M.I.T.
Dr. George T. Wolff
Former Chair EPA's Clean Air Scientific Advisory Committee
Ph.D., Environmental Sciences, Rutgers University
M.S., Meteorology, New York University
B.S., Chemical Engineering, New Jersey Institute of Technology