That is the port for the media hub inside the armrest/console. Used for updates to the radio if you download it to a USB stick. Or you want to play music.
One way to help ensure the cable does not come loose would be to apply electrical tape around the housing when connected. Support the cable a few inches from the connector, keeping it level /perpendicular with the connector/back of the radio.
If it disconnects, the media hub wont work. The rest of the radio would be okay.
The best way to fix it is to de-solder the connector, and solder a new one onto the board. This would require a very delicate hand, precision soldering iron, heat gun, or oven. A rework station. If something goes wrong, the radio could become inoperable. High cost, high risk.
If it is a good deal/price, I would buy it. I have yet to use my media hub.