Not true. Eventually they'll lose enough core heat to suffer from hypothermia even in 80+ degree water. Not to mention things in the water that will eat you. It's sad, but the ocean doesn't care. If you make a bad judgment call it can kill you.
Yes I heard the survival window was around 5 days at that sea temp......some people have survived longer...I still hope they are found ok.
Yup, in salt water you are either having lunch or you are lunch.