Acc,
The "Devil" in this case may be that the details that the Task Force has defined were not stated in exact distances in the article quoted. The journalist could have gone into the Task Force guidelines and found out how they defined "close proximity" and "customarily swim" but apparently chose not to do so, feeling their comments were adequate for the readers.
However, they seem to agree that the "public bathing beaches including in Negril, Montego Bay and Hellshire Beach, where PWC operations will be prohibited." That is a pretty firm detail they outline in their regulations.