I don’t know what you are getting at but on first glance this reflects the Celebrity guidelines for all sailings including Greek ports after September 5th.
PLEASE NOTE:
For all sailings visiting Greece, self-tests will not be accepted. Guests who are required to test must complete a supervised COVID-19 test from either an antigen test result taken within 2 days prior to boarding or a negative PCR test result taken within 3 days prior to boarding. The test must be supervised by a health professional, such as a doctor, pharmacy technician, public health worker, or telehealth representative. We are pleased to make supervised test kits available for order pre-cruise below. Fully-Vaccinated** Guests and Unvaccinated Guests may be subject to additional mid-cruise testing.