The United States also has a Countervailing Duty law, which for 22 years up until 2007 had not been applied to imports from countries that, for purposes of the antidumping law, were deemed NMEs.
In not applying the CVD law to NMEs during that period, the Commerce Department was being consistent: if prices and other market signals are unreliable or fictitious in Country A for purposes of antidumping determinations, then they cannot be reliable or useable for purposes of measuring the benefits of subsidies in Country A in CVD cases.