read the last line of your quote. it DOES say rt-pcr test required (if unvaccinated, ie most kids under 12!). why are you implying that it doesn't say that? I said specifically when referring to kids. most young kids are not vaccinated, and these new sxm rules insist on a 48 hour pcr, which is near impossible to get in St Barts on any day, and certainly not on Saturdays, Sundays or holidays.
Most countries have not authorised vaccines for the under 12's. its also questionable from a medical point of view (as the UK vaccine regulator decided. the risk/reward ratio for kids under 12 doesn't warrant a vaccination)
also, where in st Barts can you get a pcr test within the required 48 hours? the Red Cross doesn't do pcr tests every day, and quotes 48 hours for result. So you can't comply with this unless you get the pcr test earlier than they quote, which won't be compliant.
my fam travelled on jan 3rd from sbh transiting through sxm and on to our final destination. the Red Cross wasn't doing pcr tests on jan 1st (national holiday) nor on jan 2nd (a Sunday) so we weren't able to do pcr tests anywhere in St Barts for our kids (under 12) as per the new rules. we did do antigen tests and they thankfully let us in (despite telling us they wouldn't!), but they were bending the rules, as we officially weren't compliant with their new rules.