Reductio ad absurdum.

I mean, selling NSA tools on the black market in broken english is about as far from government whistleblowing as I can stretch my imagination.

Absurdum is right.

If you don't think the sentence structure and word choice was extremely deliberate you are absurd.

They probably spent a lot of time on the message. Coded words or phrases. Embedded keys. Resistance to identification analysis.

That's steganography not cryptography and generally considered to be the red-headed bastard step child of actual intelligence work. Don't be ridiculous.

Its some 4chan racist idiot's idea of a red herring.

Making sure a message doesn't contain identifying words/phrases/idioms/slang and making sure it cannot identify you through statistical analysis are not steganography and both are things I would expect any security expert (you know, like the people working for the NSA) to do if they want any hope of remaining anonymous.

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.

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".