This cute little plug connects the USB hub and DE10-nano DC and is only used with the Digital IO board.
Works fine, and looks a lot better than the 6 inch cable I had before.
I moved over to this DC jumper from using a simple cable. The MiSTer can start looking a little cluttered with so many cables plugged into it, so any option to cut down on cabling is a big win to me. Works great!