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.
I don't see how it could've possibly been an accident when they "fix it" by slightly obscuring it. It's intentional deception and censorship by Microsoft. And it is particularly galling, because Microsoft, a massive and powerful international company without serious risk is cowering in fear of the same organization that one man, with everything to lose, stood against alone. Microsoft is trying to hide that he did so.