I think you can ignore that. The engine isn't running at those revs. That's a measurement taken on switching off or more likely starting and the volts have dropped low causing it to log a fault for some reason. I'd just ignore it.
I cannot remember the value at which it accepts the engine is running. It is in the fuel mapping somewhere. I'm told they lowered the value for later cars after the hotstart issue became known but don't know what that value is either. It'll be above what the starter motor can rotate the crank at but below 750 rpm.