Even as a JW, I pretty much assumed that the QFRs were made up, although at the time I gave them the benefit of the doubt, assuming that they had distilled the essence of inquiries they had been receiving into general questions in a format that they could answer in the magazine. It does seem to me that if they are receiving a high number of letters asking questions on a certain topic, they might phrase the question in a general way and answer it in a QFR. If this is the case, then the questions may not be completely bogus, even though they may not represent exactly what was written by any one questioner.
The answers, on the other hand, are totally fictitious.