To go from a blank sheet to launch in only four years is unprecedented. Normally it takes about twice as long to get a rocket to the launchpad.

There is the case of Falcon 1, which had its first launch almost exactly four years after SpaceX was founded (March 14, 2002) — March 25, 2006, And, it had actually reached the launch pad the previous October, when SpaceX had first hoped to launch it.

Now, it is unfair comparing anyone to a SpaceX accomplishment, and it is worth bearing in mind that Falcon 1 was only a small-class launcher, and a fully expendable one at that — not a mostly reusable medium class launch vehicle, as Neutron is. (Also, of course, that first Falcon 1 launch was a failure, having a fatal failure at T+26 sec. I think Peter Beck would like to do a bit better than that on hist first launch attempt.) So I think you are right that we should regard it as a remarkable accomplishment if they are able to stick to this schedule. Aside from possibly Stoke, they seem to be moving faster than any other launch company right now. I hope they can pull it off!