Booster shots are irrelevant for entry into SXM at present. So, they should not even be referred to in the rules. For ME, personally, we are boosted, for sure. But, when one is talking about entry into SXM, they are currently irrelevant.
Someone from the SXM government needs to sit down and READ the requirements on the official site, from top to bottom, to ensure that the requirements make sense, read together. If booster shots are irrelevant to admission to SXM, which apparently they are, then it should say that, or just not refer to them altogether. If the only test that is currently acceptable if you are not vaccinated, is a PCR test, just say that. Or if you can do an antigen test, say that, and say what the time period is for that. It really is pretty easy to just sit down and write what the current requirements are. Just READ the requirements, top to bottom, and make sure they make sense together.