Does enough power pass through the USB-C data connection to charge a connected device?
You are correct USB C does have the ability to transfer data and act as a power supply simultaneously via one cable and one connection point.
As I understand it when I place my pre-order Mike from WA said during testings Woo Audio didnt like the noise related to the single power and data transfer. If I remember correctly he said that they were going to separate the data from the power to isolate and keep noise to a minimum. I think there are two USB C sections to this amp.
But again this was a distant memory of a telephone call with Mike many months ago so I could be wrong. Please double check with WA to confirm as I'm not 100% certain.