Kenny and Keeran Banned from Party Soc-Econ Group

This old, but excellent article on the Second Economy in the USSR by the authors of Socialism Betrayed was not posted to the Communist Party's socialist economics group because one of the moderators deemed it "not pertinent to this site," and that discussion of the USSR is irrelevant. Since the USSR was a socialist state, and the Party's socialist economics group is for discussing, well, socialist economics, the reasoning isn't clear to me. Indeed, we had been discussing the Soviet Union on the group only a few days prior. Why the sudden change?