PM Holness has stated that:
"Visitors must upload their test results to the Visit Jamaica portal.
The prime minister said, while approval for entry is subject to pretesting, negative results do not mean automatic approval as permission to enter is still risk-based."
So my information was correct in the initial interpretation of the the directives. Even after uploading your negative results to the VisitJamaica.com site, you may still be denied depending on your risk based answers to the question.
Keep checking back for more clarity as this thing gets more formalized.