A distro with an XP-based interface might be of more use than you think. Some computer users are seriously thrown when faced with something that looks entirely alien. But if they see a graphical interface that looks and (apparently) works just like they're used to, they're much more likely to give it a fair go. Yimf might help to encourage new users to try Linux. So it's not a case of "fooling people". It's a way of helping them.
Many forum members would say that the XP interface is horrible. But awful or not, it is nevertheless what a great many computer users are used to. It's what they know. Using what they know to help them learn something new is a tried and tested educational strategy.