Makes sense to me. I can recall freezing my butt off in a full 4/3 in Islamorada in a powerful front many years ago during a all day session. I think the guys in Miami were thinking of shorter sessions for east to southeasterly winds. A honking strong NW or even NE wind can sometimes get real cold particularly if you're out for hours.
Mount Trashmore is famous, it is featured in James Hall's "Bones of Coral." An old favorite of mine, lots of colorful (read bizarre) South Florida personalities in this one.