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I agree the title is confusing. As far as I understand everything is unsupervised except for the sentiment neuron. The paper itself is actually a better read.

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Yes, it's coincidental rather than unsupervised... The fact that to have a good "next character" prediction, you need to know about the "mindset" of the author makes sense. Especially in the context of product reviews.

Had they created a next-move predictor for chess, they wouldn't have been surprised to find a neuron representing the aggressiveness of the player.

It's a good result on its own but the word "unsupervised" is a bit annoying.

They are using the term unsupervised properly, but do I like your characterization of callling it "coincidental". That is basically the essence of unsupervised learning. We have a system doing something (typically some form of optimization), and "coincidentally" it learns something useful that we did not explicitly tell it.

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