I don’t understand your point.

Nobody drinks the ocean. Fluoride is barely active topically. Most humans rarely if at all swim in the ocean.

This topic is extremely sensationalized. It’s impossible to discern the truth anymore. All we know is he’s a murderer, many of his supposed victims are (were) alive, and had he a mansion with a weird floorplan, which was more likely to defraud investors than it was to kill people. Pulitzer got famous from this.