One would hope so. But the software and the report come from the Natural Resources Defense Council, a leftie disarmament think tank. From the article:
Using the software, researchers estimated it would take 124 weapons to destroy the U.S. and 51 to eliminate Russia as a country. The computer program mimics the U.S. military's SIOP, or Single Integrated Operational Plan, which outlines the targeting of America's nuclear weapons and the likely consequences of each attack. SIOP is so secret that even members of the U.S. Senate, with high-level security clearance, are not allowed to know the details. The Natural Resources Defense Council scientists used declassified U.S. government information such as radioactive fallout projections, satellite photos, census data and maps of military installations to develop their software.