One of the most common misconceptions about octane I come across, is people think the higher the octane the more flamable or powerful the fuel is. In reality, the higher octane actually raises the flash point, meaning higher temps are required to ignite the fuel. This is why it makes more power because it allows the engine to squeeze it more before igniting it causing a bigger bang. A low compression engine may have difficulty generating enough cylinder temp (which cylinder pressure is partialy responsible for), to completely burn the fuel, consequently reducing engine efficency.
So what they said about no benefits to it in a low compression engine!
