Academy City is the most scientifically advanced city in my world and is capable enough to rival the military might of other superpowers solely through technological superiority. If it had existed in your world, Academy City would have definitely played a major role in the nuclear war that took place. I guess what I'm trying to say is that it seems strange to me that you're aware of Old Hong Kong existing, but not an entity as powerful as Academy City.

Not that I'm saying this completely rules it out from existing in your world. For all I know, everybody could have ganged up Academy City first before they had a chance to retaliate. Technological superiority can only go so far against superior numbers and resources.

[He sighs]

It really is a shame we have no way of actually verifying its existence.