If you'll look back in the thread, it's been reported that the authorities contacted the owner and/or captain
of the boat and it was not not abandoned and/or floating around with a mysteriously absent crew. So unless the headless bodies took the boat out without the owner/captain's knowledge and subsequently jumped off or were killed and thrown off, the boat had no connection with them other than to be in the same area where they were found.
The title of the thread needlessly leads people to think that sailing a boat in that area might cause you to lose your head
. It may be a location that is prone to violence against tourists but it has nothing to do with boats.