True. They probably should have used some Lumias and Android phones since there are plenty of those that look sufficiently glamorous for these photo shoots and won't leave observant technical audiences feeling misled.
That said, wireless charging doesn't feel to me like a "flagships only" feature. I've been using Qi with my Lumia 920 for 2 years now; this doesn't seem like a flagship phone, but perhaps it was when I got it?