Was that for real?
As much as I have misgivings about the current PPL nav teachings and its practical use in times where there are many GPS devices available, it seems a good test of the ability to do a QXC without having a GPS. But I am not sure it's something that a flying school can control because (although not SkyDemon), there are a handful of moving map apps which work on most modern phones, and denying someone the right to take their iPhone for example would be harsh.