Oh my god.
Do you even understand what you're saying.
1. Cory went to the "Golden City" over 1000 years ago.
2. Elven history is way , way older then that.
3. What the elves call things is different from what humans or even tevinter call thing. Aka how each culture has a different name for the sky.
OK, so tell me, how can the Black City, and Arlathan have existed at the same time, if one predates the other by centuries? You see, the point I'm debating here is that the poster I initially quoted stated that the Black City and Arlathan must have co-existed. I have yet to see anything provided that demonstrates that they did. I have seen some conjecture about the Avaar, I have seen you claim that Cory went to the Golden City 1000 years ago, but that's not news, I stated the same information myself. So instead of trying to run down my intelligence, provide something that demonstrates that the Black City and Arlathan co-existed.
Tevinter and Southern Thedas call it the Black City, independently, I might add. So people in both of these cultures are now seeing a Black City, but when Cory went, he was going for the Golden City. He claims it was already black, but the Chantry claims that their hubris was what caused it to turn black. That's the information we have, and that transformation could have been instaneous, or nonexistent, we don't know. What we do know is that you have provided evidence that it was still the Golden City before Cory went. Arlathan was destroyed well before Cory went, and so, if our information is correct, the Black City and Arlathan could not have existed at the same time. Now, if you have some lore that counters that, do share, but "OMG, you're so dense, why can't you just accept my theory" isn't going to cut it as proof.