This isn't true either. If you're using an IP lookup to determine the user's current country, that's still processing PII (since many courts have already ruled that an IP address is unique enough to identify a person -- technical challenges notwithstanding).

However, you have a clear and stated use case for processing that PII so consent is not required, but you are required to mention this processing in your privacy policy. Not publishing this processing is (strictly speaking) a violation of the GDPR, but the processing itself isn't.