Wasn't the first Klingon visit before the pyramids were built?
No, it wasn't. That was the first visit by the Predator aliens, a totally different fake-reality.
Unless it was claimed in TNG, DS9, or one of the other non-canonical franchises. In that case, it is simply a figment of some progtard's imagination. [Now, if it had been stated in TOS, we would have to take it seriously...]