Hello Lukib
From my own experience, I can tell you that the router basically works with Wingo. Since my connection does not support g.fast (max. speed approx. 130Mbit/s), this does not answer your question.
In the reviews, however, you will find some indications that answer your question:
Yandeu writes that he operates the router on a Wingo connection with 380 Mbps. (He says he has FTTS or FTTB, which claims he has the "last few metres" over copper).
You can only achieve a speed of 380 Mbit/s over copper with g.fast.
So I would say that this should work! Have fun with it :)

Hello Lukib

I browsed a bit further at swisscom and found a "newer list" with "temporary approved devices":

https://www.swisscom.ch/dam...

I'm not sure yet if I should buy the Zyxel or the AVM Fritz!Box...
Greetings