What exactly is "traditional ecumenism" to Reese?
The ecumenism of V2 is hardly "traditional."  It's syncretism, condemned by earlier popes.
Traditional ecumenism is employed when Christians of differing sects or churches work together for a genuinely common good.  It does not mean suborning Catholic teaching, or watering down our dogmatic faith, to appease those who believe and worship differently, or even to except any other religion as salvific.
The authors are right to call out specific individuals whose message is based upon an adulterated and false interpretation of Scripture.  But their efforts are entirely political.  Where were they when other individuals such as Richard Rohr, Richard Sipe, Roger Schütz and other modernists needed to be called out for "using scriptural texts out of context to give theological justification to belligerence"?