It's not as if IP addresses were
ever a reliable way to tell whether a data subject was physically located within the EU. VPNs and proxies have been around forever. Someone could be accessing your site through Tor Browser or I2P while located in the EU—and if so, these are the users who would be
most interested in limiting processing of their personal data.
Just assume that no consent is granted. Access to the site or specific services cannot depend on granting consent, which implies that anyone who does grant consent probably failed to understand that it was optional, or did so only to avoid being harassed with further consent requests. The GDPR already makes the "consent" completely one-sided with no possibility of consideration; it might as well have disallowed the requests altogether and saved everyone a great deal of hassle.