Yes, the cable is power supply.
I’ve got the cable (USB A to USB C) feeding the quite pricey wireless charging head from QuadLock. I also added the vibration dampener to the assembly. Been using it for 2 years now (roughly 20,000 km) and quite happy with it. Whenever I upgrade my iPhone 11 Pro I’ll continue with the QuadLock system.
The USB device you’ve added to your Striple is on sale here in Canada on Amazon, I’m seriously thinking of getting one for my wifes Ducati Scrambler…for the price it mighbe worth getting 2 just in case I need it down the road.
I’m also a fan of the Chubby Buttons remote for riding, those big buttons are super easy to use for volume control when I wear my AirPods on occasion. The Chubby Button has held up well in cold and rain as well (I’ve use them at the ski hill to cut out chattering on the lifts- sorta antisocial at times).
Currently 1C, it was a chilly ride when I went for groceries and mail…