According to their email, they think I'm a UK user:
"because the United Kingdom (UK) is leaving the European Union (EU), Google LLC will now be the service provider and the data controller responsible for your information and for complying with applicable privacy laws for UK consumer users"
But I'm not.
I can't say they are doing this intentionally, but it's surely a mistake and there is no way to reach them for a complain.
My understanding is that you always have the same rights. Whether Google follows them is another question.
It doesn't matter where the company stores and processes your data, as an EU resident, they still must follow GDPR rules.
EDIT: also if they believe you are a UK citizen they won't act GDPR compliant.