It’s a known fact that Google disables 5G on countries where Pixel is non listed. They should work, since other brands don’t have any trouble with it (I guess bands are standardised throughout Europe).
https://issuetracker.google.com/issues/229334870?pli=1
I wanted to buy the phone in Amazon, and in the comments there were people warning regarding the 5G situation. Google disable it in the software.
Edit: Checking that guide it should work, a year have passed so maybe they stopped doing that bullshit.
I use Safari with AdGuard to get AdBlocking.