Question about OnePlus Nord (8GB)

I have a question about the 5G support of the OnePlus nord on the Swisscom network. According to this website: https://www.kimovil.com/fr/frequency-checker/CH/oneplus-z it supports 5G on the Swisscom network, but I read a lot in the questions and answers on Digitec that it doesn't support 5G on the Swisscom network because the Oxygen software is not designed for Swisscom. Oneplus doesn't sell this smartphone officially in Switzerland, so I'm a bit confused. Thank you very much for the answers.