Earlier quoted context omitted.
Geolocation, IP Lookup etc. You generally shouldn't care whether they're a resident in the EU, but just whether they are in EU or not. Remember GDPR doesn't cover any citizens from EU who aren't in EU.
I read that GDPR applies to EU residents. That means someone who is EU resident non necessarily could be browsing from the EU. For example when on holidays.
It's much easier and safer to just assume someone who's in Europe is a resident, rather than figuring out if they really are.
GDPR only applies to EU residents, yes, but not if they're on ex. holiday outside of EU.
Say, a EU citizen is on holiday in The U.S.
In such case the EU citizen is not protected by GDPR.