Basically, they recreated one of Socrates' lessons. The students gave similar answers to the 50 questions, but only half figured out the task at the end of the lesson. The students didn't understand the importance or goals of the questions and answers.
That's not to say the socratic method doesn't work. If you read enough research and anecdotal stories about education, you'll come to realize that everything works and nothing works. For every idea in education, research will eventually show that it is ineffective and a waste of time and resources.