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Without any science behind it or having first hand access to the source for the tools used to identify such words/phrases/idioms you're just amateurishly putting lipstick on a pig.

Its a racist idiot's idea of a joke.

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There's definitely science behind it, it's called stylometry: https://en.wikipedia.org/wiki/Stylometry

Here's an example of an open-source project designed to counter stylometric analysis: https://github.com/psal/anonymouth

With how much caution they are taking against a nation-state adversary, I think it a bit short-sighted to think that this is just "a racist idiot's idea of a joke".

There is a large body of science behind author identification, with lots of academic papers, talks at hacker conventions, etc. I'm surprised you missed it. If the NSA did use authorship identification software, would it be unreasonable to believe that a privileged leaker would have access to such a tool? I believe that it is more likely than not a joke, but it has the same effect as a right handed person signing their name with their left hand... unless they have a habit of making "In Soviet Russia..." jokes - then they're screwed.

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