The term 'up to date' erases any finality to getting shots. What this does is to make boosters infinite in perpetuity into the future. One can NEVER be 'fully vaccinated'. You can only be up to date for a particular month/year. It will never end. You will be taking so called 'boosters' (even if they are nothing but saline) for the rest of your life and the lives of your children.
This means that EVERYBODY is being put on probation. And you will be required to 'check in' with your probation officer to get your new shot every month or so, forever. No doubt when you check in, they will want to know your current address, employment status, phone number, next of kin, among other invasive questions.