Nope you didn't, I checked, you must've forgotten
The biggest indicator for me was the Pool and the apparent religious connotations associated with it. Like, the Elantrians getting old enough to want release going there to die but finding a new world. Devotion's Perpendicularity just gave the feel from both where it was physically located, to how it was narratively situated and the way it was described... it seemed as though it was placed there specifically for this purpose.
Forget AonDor, it could very well be that the city of Elantris predates Devotion & Dominion's Splintering. After all, when the people who would become the Arelish first settled in what would become Arelon, they found Elantris already there, empty.
Plus, in Mistborn: Secret History, the Ire mention Devotion in way as though they had actually met her.
And like I said before, I've always wondered if the Ire might've been the original Elantrians.
Also, did Devotion and Dominion just die to Odium? Ambition fought, Honor fought, Cultivation is still fighting. Devotion and Dominion must've fought as well, Elantris could have been a staging ground for the conflict between the Shards, which might've been why it was empty when it was found, having been on the side that lost