>>jojoba+(OP)
The equivalent would be geo-blocking the UK, and then someone from the UK travelling to the US to view your site to work around the restriction.
>>jojoba+(OP)
I think "UK citizen" should have been replaced by "person acting from within the UK". This is how it is defined in the context of GDPR - the nationality doesn't matter, what matters is where you are when you are provided services.