[robocat]

Is the English pronunciation close enough to the Mandarin (天安门广场) for the word to even be understood by someone who only speaks Mandarin?

I presume the two words are different enough that they have different censoring rules (especially since square is an English word).

I'm surprised it hasn't been renamed.

[palunon]

If you look at the significance of the place (The Tian'anmen is literally on the national emblem of China, and the tomb of Mao is on the square for example), it's hard to rename something that widely known. It's much easier to pull one of the events that happen there under the rug, because unlike in the west the name is associated to much more.