A US to Canada or vice versa move would work since they’re on the same system, but a UK number, for instance, doesn’t even have the same digits of numbers necessarily, and even if they’re both 10, they’re completely different formats.
And Google certainly knows you live in a new country, but you likely have to accept new Terms based on the country you move to, and there are more than likely fraud policies in place specifically to prevent people abusing a system like that to get lower pricing. The required step is there as policy, not a technical necessity.
At least according to that they won't ask you to accept new ToS, probably due to the fact ToS allows them to change ToS at will.
Gas equipment tends to be extremely controlled, so I can understand no-one wanting to connect to a different region's connector with possibly different regulatory standards.
I understand more with the gas due to the difference in gas canister supplies. They do actually sell replacement regional hoses, so I assumed I'd be able to just switch it out.
I thought you were talking about mains gas for the oven - they tend to get a lot more precious over that being correctly fitted than for canisters.
Also had the same problem with a gas pizza oven (Ooni), ironically from a Scottish company, but has only USA gas connections and is impossible to switch regions. I can very much sympathise with the author and am very glad consoles are no longer region locked.