That’s until July 1. Right at the top of the page it says…

AS OF JULY 1 THE rt-PCR TEST MUST BE PERFORMED ON A NASO-PHARYGEAL SWAB WITHIN 72 HOURS BEFORE DEPARTURE BY TRAVELERS ORIGINATING FROM THE USA AND CANADA. ALTERNATIVELY THESE TRAVELERS CAN ALSO PERFOM AN ANTIGEN TEST WITHIN 48 HOURS PRIOR TO DEPARTURE TO SINT MAARTEN.