Chris: This article is not accurate. In early February, the Italian government changed the vax card rules:
Link to Site
Validity of the certificate in order to use services that require a “reinforced” Green Pass.
The vaccine certificate is valid up to 6 months from the completion of the primary vaccine cycle (either the first and only dose for the Janssen Pharmaceutical NV/ Johnson and Johnson or the second dose for all the others approved vaccines). If however the carrier of the certificate has received a booster or has completed the primary vaccine cycle and he or she has recovered from COVID, the certificate validity is unlimited.
From the US Embassy for Italy
US Embassy Website
The Super Green Pass is valid indefinitely when the certification is issued after the 3rd booster dose or after the 2nd dose and recovery from Covid. For those who have not recovered from Covid but received the second dose, the Super Green Pass remains valid for only 6 months.