The USB ports on my desktop remain powered in standby/suspend/off, so that a keyboard or other input device may wake up the machine. That’s by design.
However, the Revopoint Mini is not an input device capable of generating a wakeup event. Therefore it should honor the USB suspend state and power itself fully off.
Mine does not power itself off. It remains on, with a dim glow of blue laser out the front, the green LED on the back lit, and the body of the scanner is almost as warm as when it’s in full operation. That’s obviously not in compliance with the intent of the USB suspend state!
IIRC, there are modes where USB can be configured to keep Video inputs powered to provide motion wake detection. That seem a plausible reason it might be powered, check into turning off that capability.