I feel like people knew the Twin Towers were taller? And probably also that the Freedom Tower is taller? The latter certainly had a lot of publicity (for reasons that are probably at least somewhat related to the points in this post, albeit a few abstractions removed)
As a foreigner i have a vague hunch that it’s probably no longer the tallest (cause come on, it can’t be for that long, right?), but there isn’t a different building I’m aware of that i would pick as probably taller.
People probably do start paying less attention as more Big Tall buildings are made, because it gets less interesting the more you do it. But I also think the Freedom Tower has basically all the advantages a Schelling point could have in terms and if publicity and narrative cohesion.