You have to read the texts correctly or interpret them correctly:
Advertising: inOne mobile go, unlimited surfing, telephony and SMS in CH and EU (½)
-> means exactly what is written:
unlimited surfing (40GB EU, then throttling to 128kbit/s), telephony and SMS in the CH and EU = unlimited calls within CH and within the EU.
It doesn’t say to the EU (Switzerland is not in the EU). Unlimited telephony is included, e.g. calls from Zurich to Bern etc., and e.g. calls from Cologne to Hamburg etc.
However, you are right that the inOne mobile XS includes a telephony quota of 30 minutes to EU.
Best regards!