It is now 72 hours, yes. Supposedly the reason is that it is now easier to comply with the 72 hour rule for PCR tests or 48 hours for antigen tests, than it was a few months ago. They announced well over a month ago that 'soon' they would start accepting proof of vaccination only, in order to allow entry into SXM. Instead of giving a date to accept only proof of vaccination, they subsequently announced the change to 72 hours. Truthfully, I think it IS easier now to accomplish (in the US anyway) than it was months ago, at least for those who don't have an overnight trip from the West Coast.