At that stage in a takeoff you are accelerating at approx 7kts per second per second, so the concept is that as you finish saying V1, you will have reached that speed. During training in Seattle, Boeing told us that Lufthansa had introduced this procedure.
That's reasonable enough but, tell me, when is the Auto Call Out the Boeing installs triggered?
Surely if the manufacturer wanted the V1 call to start prior to the speed, it would have installed a device that did just that?
Fact is, I doubt the second or so difference 5 knots is going to make would ever be the difference between success or failure.