You are incorrect. There have been some posts, including one HERE by eightzerobits, that said that they had a problem, flying YESTERDAY, because the gate agent said the test result did NOT say PCR. They substituted a different test and were approved. The fact that most people are getting through OK doesn't mean that it is in fact a PCR test. If SXM wants to accept it, even though it is not a PCR test, then that's fine, but the official rules say it has to be PCR or antigen. If they are going to say it is acceptable, even though it is not a PCR test, then the rules should say that.
The question remains--is it in FACT a PCR test? Knowing my luck, I will be the one who gets denied entry for using it, even though the vast majority of people are having no problem with it.