The only IP that we retrieve is from the HTTP request of the server sending data. Then a GeoIP local database gives us a ISO Code of the country, if successful, the IP is threw away, otherwise no info is logged, just a log signaling that some IPs are not resolved in countries (and the request rejected)
This follows the principle of the link you sent:
Personal data that has been rendered anonymous in such a way that the individual is not or no longer identifiable is no longer considered personal data. For data to be truly anonymised, the anonymisation must be irreversible.