Yes - I think so if the Swisscom TV Box also supports WPS.
However, I would only advise you to buy the WAC104 if you know enough about how to configure it on your notebook. It is NOT set to DHCP by default. The tool on Netgear.de with http://www.aplogin.net to get to the login of the WAC104 with an assistant in the browser does not work. This means setting the IP of the notebook manually - and reading the manual beforehand. Then switch everything to DHCP. Good luck.

After upgrading the firmware of the WAC104 to V1.0.4.9, Swisscom TV works for me. With the old firmware V1.0.4.8, Swisscom TV reported that the WLAN was too weak.