This got interesting even faster than I expected! This has to be being imposed by the cruise companies, which probably figure they have the government by the balls. And which now doubt are freaked by the Covid spike.

Come high season, however, there are ships in port at least six days/week. That would mean the Baths are effectively closed to residents and visitors! You could swim in from a mooring at daybreak, or go late afternoon, but that wouldn't give a charter boat much time to get to an anchorage by sunset. So people who spend $$$$ to charter a boat would be excluded for the benefit of $7/day visitors.