I used a similar technique to one of those the article mentions -- just learning to passively accept when I'm hearing a voice. I often hear benign voices -- they say things like "Go buy milk!", "Wear shoes with laces you can tie!", "Cross the road now!", "The sky is green today!", etc. -- and I don't think they have any particular meaning. Nor do I care if they do have meaning, whatever it is must be pretty banal
I just learn to sit with them and not just passively do or believe whatever they say. I can even dismiss/tolerate even the occasional aggressive voice with this kind of attitude, but I can see how you wouldn't want to do that if your voices were mean to you constantly.