I did find a clarifying comment from some Youtube user:
EDIT:https://www.youtube.com/watch?v=5HBRHQ2Abik wrote:Seems no data cables on USB are used - only +5V and GND. Right next to USB port it must be a push type voltage regulator, for sure it doubles the USB supplied +5V into 9V. Definitely not a digital effect. 2 PCBs are required to fit all big components - jack barrels, footswitch and pots.
Oh, and this reply by Ryan Burke:
cuvave wrote me. They said they it’s there for the few pedals that use digital code and need software uploaded. But a few people have discovered that they can be powered off the usb