Microsoft has acknowledged this is in error...[1] (though the error seems to be that censorship meant to just apply to China is being applied everywhere)
[0] https://news.ycombinator.com/item?id=27395635
[1] https://www.vice.com/en/article/qj8v9m/bing-censors-tank-man
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There is no way this is due to an accidental human error. The lying on this point is infuriating.
There is no way to know if it is true, but it is definitely possible. This is probably an interface that isn't used incredibly frequently and may not be as polished as one might hope.