True, but given their small size might be real difficult to line them up properly on a typical qi charger.
I think you may be right, we don't know how big they are but they'll keep them as tiny as possibile.
Besides, the most important thing is how often you need to charge them. I'd buy a similar product only if I needed to charge every 2-3 months, otherwise it would be too annoying to keep it charged even if it was Qi.