I just got back a response from The Jamaica Tourism web site @ 8am today. "Please note there has been some adjustment to our protocols. The new measure will come into effect on MARCH 10 2021. Therefore, a test done on March 1st can be used for March 5th." (this pertains to MY travel dates)
So it seems they have moved the new date to March 10 2021 in relation to the 72 hours Covid testing. FYI .
I have made a copy of the email & will bring it with me just in case.
I sent my email last night @ 9pm and got this response today @ 8am.