Nigel.

No, but it should have been important to a self-proclaimed archaeologist. And the period between the pharaohs and Coptic Christians should have been at least 60 years.

Jim doesn't mention that the tour guide proclaimed him or her self an archaeologist. It could have been an archaeology tour guide mis-spelt or auto corrected. Jim may have assumed something incorrectly. Or maybe the tour company got it wrong.

As to the BC thing. Who knows when or even if this Christ person was born?And

If you are going in for Olympic standard pedantry you could at least try to get things right yourself.