I bet most tall towers sway a bit, and are designed to do so. Though from the top, I couldn't feel it swaying.
I doubt a photo would be able to capture the level of sway that happens. The effect I captured in the photo I think is due to the subtle concave angle of the sides, accentuated by the angle of the photo.
There's that, and there was a huge wait to get up to the top. It felt like we went from one line, to another to another, probably 6 times in total before we got in the elevator. The kids still liked it though.