This is not a new "mystery". If you search on the web you'll see various reports which site notions like the "Curse of Palmyra".
There was a reported search of a boat that supposedly left Palmyra headed for Hawaii with Hughes PLUS FIVE on-board (not four). There was all kinds of speculation of the name of the boat being close to another boat in which there was a double homicide, then the murders dumped the bodies and headed for the U.S.. They were convicted of killing, stealing the boat, and robbing the victims. The name of the murdered Captain of the boat was (as I recall) Mac Hughes.
Coincidence? WTFKs.
Anyway, the whole story falls apart and becomes boinky when you supposedly know the name of the San Diego based family (and can find no record of them) and a U.S. Boat.
I don't know if the poster is just musing, curious, trolling, looking to write a fictional (or speculative) book, or what. Why he would presume that anyone on this board knew anything about the matter that supposedly happened over 30 years ago, I know not.
When the Internet morphed from a doomsday survival artifact to whatever it's become(ing), I guess this is just a bi-product of that. :^))))