I'm not sure there's a consensus, I expect it depends on your astronomical area of study. If you study the whole universe, than our solar system at 4.5B years old is pretty recent compared to the 14B years of the universe, so there's no ancient history of the moon.

I'd say if you studied the moon, anything that happened in it's early lifetime is ancient so the protomoon and first billion years into it's existence, maybe.

I guess it's similar to how people studying evolution class Humans as a recent event, but people who study humans class the the Pyramids as ancient history.

In the infiniteness of time, 2 billion is a blink if the eye.