Thank you! I will have to go through this site and find the other objections he made. It was a list of about ten different things. In true Thomistic fashion, I think it is good to address the strongest arguments of the other side, and these seemed pretty solid, though of course I disagree with the conclusion.
In any case, replacing a cloistered nun with an imposter doesn't seem all that difficult of a task anyway. You're talking about someone who lives a secretive life and only comes out about once per decade to give an interview or appear on TV, and when she does come out she is covered with a habit that obscures her entire body including even a good part of her face. You don't exactly need CGI or Hollywood special effects artists to create a double for someone in that condition of life.