Orbi has only a single WiFi SSID/password. If the teenager were able to change it, then every other device in the house would immediately lose connection. My guess is that is not what he is doing. It is more likely that he is tinkering with the settings on his computer to (a) give it a different MAC address, thus fooling Disney Circle into thinking it is a different device, or (b) changing his DNS settings from those assigned by the Orbi so as to avoid Disney Circle entirely.
I have no kids at home, and no Disney Circle on my Orbi, so I can't do any experiments. Just personally, I would probably start with a Google search on how to get around Circle or post in the Netgear forum devoted to it: https://community.netgear.com/t5/Circle-Smart-Parental-Controls/bd-p/en-home-circle
