That caught my eye as well. RMS is intended as a way for manufacturers to show continuous power output capacity (though some electrically minded folks have told me that it's misused), and peak power is sometimes referred to as "short term." Not sure why they would put it that way.

Reminds me of amps whose power is only rated at "[xxx] watts @ 6 ohms", to me a good way to confuse those of us with 8 ohm speakers and poor math/electrical skills.