Earlier quoted context omitted.
Can't you attach your phone to a computer and grid power with a USB cable?
Off the top of my head I don't think you can with the gear vr (doesn't the USB port get taken up by the headset?), but even if you can, one of the authors key complaints leading into that statement was that the rift was not wireless. If you told him to wire up his gear vr, he wouldn't be impressed.
The original Gear VR ("Innovator edition") could not be charged while used though if I remember correctly.