He actually moved to JPX improvement irons to get more distance and make his game easier. He will also tell you why irons are going further now - jacked up lofts and longer shafts.
He has also said many times that whatever club you use it is about having the ball hit the middle of the face and have a straight clubpath at impact. The guy gives out tips and advice for free, why knock him. It is only an opinion he gives and he advises you to try out stuff and get your own opinion on it.
Any plain easy to understand instruction is ok in my book.