Its overclocked wrt to the design parameters of the device (battery voltage). The rated clockspeed is what can be sustained over the lifetime of the device, not

Its overclocked wrt to the design parameters of the device (battery voltage). The rated clockspeed is what can be sustained over the lifetime of the device, not the peak speed. The fact you can temporarily push a faster clockspeed is not what you can claim is "normal". So, the speed reduction is not "rated" -> "throttled" because it was not sustainable, it was actually "overclocked" -> "rated".