1984 is a very popular and influential book.
I fairly confident that if you asked the authors of Avatar The Last Airbender they would tell you straight that they’d based that idea on 1984.
I’d be willing to bet people will be quoting 1984 long after ATLA has been forgotten.
The original two posters in this thread were also intimately familiar with Ba Sing Se / Avatar the Last Airbender. So multiple people here are fully aware of the reference and are in good communication.
I probably wouldn't reach for a reference to ATLA myself. But, apparently its popular enough that plenty of different posters in this very discussion are aware of it and able to explain to other people here the concept.