They are not referred to as a NGO, it says that " The following non-governmental organizations responded: the Associazione Comunita Papa Giovanni XXIII, the Centre for Civil and Political Rights, the European Bureau for Conscientious Objection, the European Organisation of Military Associations, Forum 18 News Service, the German Institute for Human Rights, Human Rights Watch, the International Fellowship of Reconciliation, Jehovah’s Witnesses, the Quaker United Nations Office, the Russian NGO Soldiers’ Mothers of St. Petersburg, the Union of Conscientious Objectors, and War Resisters International."
There are no capital letters in the phrase "non-governmental organizations", so they are just that - organizations outside of the government, non-official. But if you see the Russian NGO Soldiers' Mothers of St. Petersburg" they are careful to use the capital letters there in identifying the group as a "real" NGO.