It’s a simple adapter USB-C male to female, in an angle, making the cable go behind the Deck, so it doesn’t wiggle on top.
Can you clarify what the problem is that this solves? Your charging cable wiggles too much when it is plugged into the top? If so, I don’t appear to have that issue at least that I’ve noticed.
It just changes the direction of the cable so instead of sticking straight up the cable gets redirected and now is nearly behind the deck and flowing down.
Where it’s going to be bent by the table or whatever it’s resting on anyways?
Presumably the hand grips on the deck keep enough of a gap under the deck to keep this from being an issue.