I suspect someone is confusing black ice with something else. Black ice is absolutely "ice" and only occurs when the pavement temperatures drop to 32 deg. Fahrenheit or below, most commonly on bridges and overpasses or shaded areas. It is also not really "black", it is so called because the pavement appears slightly damp but otherwise normal in color and texture as opposed to a sheet of ice from freezing rain or packed snow. If you have something black and slippery on the pavement and it's hot out it isn't "black ice".