If this was taking place in 23AD (which I also had heard before) it really does not make any sense in tying in with other things we have seen in the past.
First, all of the Egyptian stuff (temples, statues, hieroglyphics, pictures) would have had to come way before 23AD, yet none of it was present on the Island in this episode (the statue would have been visible from the donkey wheel well) since it was visible from there in season 5.
So how did all of the Egyptian stuff end up on the Island? Did the Island jump through time to a 1000+ years before this episode took place to have the Egyptians end up on the island and build all that stuff?
Who re-dug the well and finish off building the donkey wheel contraption? Who built the original stone wall blocking off the energy? The wall the MIB started to take apart before his mom killed him?
And this is another possible mistake (unless the island has undergone major geographical modifications sometime from this episode to the present) but the Donkey Wheel was super super deep into the island's core. Remember the super deep well that led down to it? Remember the long elevator ride in the Orchid station to get down that deep? The well we saw in this episode wasn't very deep at all. 20-30 feet, that's it.
So how did it end up getting so deep later on? Also, when we last saw this well and the Orchid station, etc... there was a temple near by and it was on top of a hill!
No hill in this episode. No ancient temple near by.
So, going by what we've seen, at some point between when this episode took place, a bunch of Egyptians had to come to the island, build tons of temples, statues, etc... (which would take 100+'s of years given the number of them that we've seen (or that literally thousands of Egyptian slaves were brought to the island to build all this stuff really quickly)) and then all die off before Richard shipwrecked on the island. Plus, all the Island geography would have to change with hills rising up, burying stuff way deeper into the ground then what we've seen.
All that could be (some what) possible if this episode had taken place way, way earlier then it seemed to. I mean, way back, pre (or concurrent) to the hight of the Egyptian empire. So, something like 3000BC? but then, I believe that was way before Latin was a language and it would make no sense for the mom to be speaking it this episode.
So, I guess the only way to resolve these questions is to assume that the island at some point in time, went back in time.